delivered the opinion of the Court.
The respondent Charles Hawn sustained severe physical injuries when he slipped and fell through an uncovered hatch hole on the petitioner Pope & Talbot’s vessel. The ship was then berthed at a pier located in Pennsylvania waters of the Delaware River. Loading of the vessel with grain for a voyage had been temporarily interrupted to make minor repairs on the grain loading equipment. Hawn was doing carpentry work on this equipment to make it spread the grain evenly and thereby balance the ship’s load to make the coming voyage safer. He was not an employee of Pope & Talbot’s but of the respondent Haenn Ship Ceiling and Refitting Company which had been hired to make these repairs. Hawn brought this civil action in a United States District Court to recover damages for his injuries. His complaint charged that his injuries resulted from the vessel’s unseaworthiness and from Pope & Talbot’s negligence. In answering, Pope & Talbot denied both charges and set up contributory negligence as a defense to each. In addition, Pope & Talbot brought in Hawn’s employer Haenn as a third party defendant, alleging that Haenn’s negligence had caused Hawn’s injury and claiming recovery over against *408Haenn by way of contribution or indemnity. A jury found that the ship was unseaworthy, that Pope & Talbot had been negligent, that Haenn had been negligent and that Hawn’s own negligence had contributed 17%% of his damages. On this basis, the court entered judgment for Hawn against Pope & Talbot for $29,700,17%% less than the $36,000 at which the jury had fixed his damages. A judgment for contribution by Haenn to Pope & Talbot was also entered. 99 F. Supp. 226, 100 F. Supp. 338. The Court of Appeals affirmed Hawn’s judgment against Pope & Talbot. It reversed the judgment of contribution against Haenn. 198 F. 2d 800. This Court granted certiorari. 345 TJ. S. 990.
The Court of Appeals reversed the judgment for contribution by Haenn on the basis of our holding in Halcyon Lines v. Haenn Ship Ceiling & Refitting Corp., 342 U. S. 282. In that case we held that contribution could not be exacted under circumstances like those here involved. For that reason we affirm the Court of Appeals reversal of the District Court’s judgment against Haenn and proceed to a consideration of the several questions presented by Pope & Talbot as grounds for attack on Hawn’s judgment.
First. Petitioner urges that the jury finding of contributory negligence should have been accepted as a complete bar to Hawn’s recovery. The contention appears to rest on two separate bases: (a) Admiralty has not developed any definite rule as to the effect of contributory negligence, and therefore the common-law rule under which contributory negligence bars recovery should govern in admiralty, (b) Pennsylvania law controls this case and under that state’s law any contributory negligence of an injured person is an insuperable bar to his recovery.
(a) The harsh rule of the common law under which contributory negligence wholly barred an injured person *409from recovery is completely incompatible with modern admiralty policy and practice. Exercising its traditional discretion, admiralty has developed and now follows its own fairer and more flexible rule which allows such consideration of contributory negligence in mitigation of damages as justice requires.1 Petitioner presents no persuasive arguments that admiralty should now adopt a discredited doctrine which automatically destroys all claims of injured persons who have contributed to their injuries in any degree, however slight.
(b) Nor can we agree that Hawn’s rights must be determined by the law of Pennsylvania, under which, it is said, any contributory negligence would bar all recovery in this personal injury action. True, Hawn was hurt inside Pennsylvania and ordinarily his rights would be determined by Pennsylvania law. But he was injured on navigable waters while working on a ship to enable it to complete its loading for safer transportation of its cargo by water. Consequently, the basis of Hawn’s action is a maritime tort,2 a type of action which the Constitution has placed under national power to control in “its substantive as well as its procedural features . . . .” Panama R. Co. v. Johnson, 264 U. S. 375, 386. And Hawn’s complaint asserted no claim created by or arising out of Pennsylvania law. His right of recovery for unseaworthiness and negligence is rooted in federal maritime law. Even if Hawn were seeking to enforce a state created remedy for this right, federal maritime law would be controlling. While states may sometimes supplement *410federal maritime policies,3 a state may not deprive a person of any substantial admiralty rights as defined in controlling acts of Congress or by interpretative decisions of this Court. These principles have been frequently declared and we adhere to them. See e. g., Garrett v. Moore-McCormack Co., 317 U. S. 239, 243-246, and cases there cited. Caldarola v. Eckert, 332 U. S. 155, does not support the contention that a state which undertakes to enforce federally created maritime rights can dilute claims fashioned by federal power, which is dominant in this field.
Another argument is that Pennsylvania law must govern here because the District Court’s jurisdiction was rested on diversity of citizenship under 28 U. S. C. § 1332.4 For this contention the principle established in Erie R. Co. v. Tompkins, 304 U. S. 64, is invoked. That case decided that federal district diversity courts must try state created causes of action in accordance with state laws. This ended a long-standing federal court practice under which the outcome of lawsuits to enforce state created causes of action often depended on whether they were tried in a state courthouse or a federal courthouse. Erie R. Co. v. Tompkins was thus designed to ensure that litigants with the same kind of case would have their rights measured by the same legal standards of liabil*411ity. It appears to be contended here, however, that one injured on navigable waters who sues in federal court under diversity jurisdiction somehow jeopardizes his right to have as full a recovery as he otherwise would. It is certainly contended that one who sues on the “law side” of the docket has much less chance to recover than one who sues on the “admiralty side.” Thus we are asked to use the Erie-Tompkins case to bring about the same kind of unfairness it was designed to end. Once again, the substantial rights of parties would depend on which courthouse, or even on which “side” of the same courthouse, a lawyer might guess to be in the best interests of his client. We decline to depart from the principle of equal justice embodied in the Erie-Tompkins doctrine. Of course the substantial rights of an injured person are not to be determined differently whether his case is labelled “law side” or “admiralty side” on a district court’s docket. Seas Shipping Co. v. Sieracki, 328 U. S. 85, 88-89.5 The District Court and Court of Appeals correctly refused to deny Hawn’s federal right of recovery by applying the Pennsylvania contributory negligence rule.
Second. Haenn has been making compensation payments to Hawn because of obligations imposed by the Longshoremen’s and Harbor Workers’ Compensation Act. 44 Stat. 1424, 33 U. S. C. § 901 et seq. Hawn has agreed to refund these payments to his employer out of his Pope & Talbot recovery. Pope & Talbot contends that the judgment against it should be reduced by this amount. *412It points out that Hawn’s verdict includes sums for past loss of wages and medical expenses which it is argued were the very items on account of which Hawn’s employer paid him. Consequently Pope & Talbot says that if Hawn keeps the money he will have a double recovery and that to allow him to repay Haenn would give an unconscionable reward to an employer whose negligence contributed to the injury. A weakness in this ingenious argument is that § 33 of the Act has specific provisions to permit an employer to recoup his compensation payments out of any recovery from a third person negligently causing such injuries. Pope & Talbot’s contention if accepted would frustrate this purpose to protect employers who are subjected to absolute liability by the Act. Moreover, reduction of Pope & Talbot’s liability at the expense of Haenn would be the substantial equivalent of contribution which we declined to require in the Halcyon case.
Third. We are asked to reverse this judgment by overruling our holding in Seas Shipping Co. v. Sieracki, 328 U. S. 85. Sieracki, an employee of an independent stevedoring company, was injured on a ship while working as a stevedore loading the cargo. We held that he could recover from the shipowner because of unseaworthiness of the ship or its appliances. We decided this over strong protest that such a holding would be an unwarranted extension of the doctrine of seaworthiness to workers other than seamen. That identical argument is repeated here. We reject it again and adhere to Sieracki. We are asked, however, to distinguish this case from our holding there. It is pointed out that Sieracki was a “stevedore.” Hawn was not. And Hawn was not loading the vessel. On these grounds we are asked to deny Hawn the protection we held the law gave Sieracki. These slight differences in fact cannot fairly justify the distinction urged as between the two cases. Sieracki’s *413legal protection was not based on the name “stevedore” but on the type of work he did and its relationship to the ship and to the historic doctrine of seaworthiness. The ship on which Hawn was hurt was being loaded when the grain loading equipment developed a slight defect. Hawn was put to work on it so that the loading could go on at once. There he was hurt. His need for protection from unseaworthiness was neither more nor less than that of the stevedores then working with him on the ship or of seamen who had been or were about to go on a voyage. All were subjected to the same danger. All were entitled to like treatment under law.
Fourth. A concurring opinion here raises a question concerning the right of Hawn to recover for negligence — a question neither presented nor urged by Pope & Talbot. It argues that the Sieracki case, by sustaining the right of persons like Hawn to sue for unseaworthiness, placed them in the category of “seamen” who cannot, under The Osceola, 189 U. S. 158, maintain a negligence action against the shipowner. The Osceola held that a crew member employed by the ship could not recover from his employer for negligence of the master or the crew member’s “fellow servants.” Recoveries of crew members were limited to actions for unseaworthiness and maintenance and cure. But Hawn was not a crew member. He was not employed by the ship. The ship’s crew were not his fellow servants. Having no contract of employment with the shipowner, he was not entitled to maintenance and cure. The fact that Sieracki upheld the right of workers like Hawn to recover for unseaworthiness does not justify an argument that the Court thereby blotted out their long-recognized right to recover in admiralty for negligence.6 *414Neither the holding nor what was said in Sieracki could support such a contention. In fact, the dissent in Sieracki appears to have been predicated on an objection to adding unseaworthiness to the existing right to recover for negligence. It would be strange indeed to hold now that a decision which over the dissent recognized unseaworthiness as an additional right of persons injured on shipboard had unwittingly deprived them of all right to maintain actions for negligence.
Affirmed.
E. g., The Max Morris, 137 U. S. 1; The Arizona v. Anelich, 298 U. S. 110, 122, and cases cited; Socony-Vacuum Oil Co. v. Smith, 305 U. S. 424, 428-429; Jacob v. New York City, 315 U. S. 752, 755; and compare Garrett v. Moore-McCormack Co., 317 U. S. 239, 244-245, with Belden v. Chase, 150 U. S. 674.
Atlantic Transport Co. v. Imbrovek, 234 U. S. 52, 61-63.
See e. g., Just v. Chambers, 312 U. S. 383, 387-392; Kelly v. Washington, 302 U. S. 1, 13.
The complaint shows diversity which is sufficient to support jurisdiction of the District Court. The complaint also shows that the claim rests on a maritime tort which under the Constitution is subject to dominant control of the Federal Government. In this situation we need not decide whether the District Court’s jurisdiction can be rested on 28 U. S. C. § 1331 as arising “under the Constitution, laws or treaties of the United States.” See Doucette v. Vincent, 194 F. 2d 834, and Jansson v. Swedish American Line, 185 F. 2d 212. Cf. Jordine v. Walling, 185 F. 2d 662.
Of a somewhat similar contention this Court said that it did not regard certain words in the Jones Act, 41 Stat. 1007, 46 U. S. C. § 688, “as meaning that the seaman may have the benefit of the new rules if he sues on the law side of the court, but not if he sues on the admiralty side. Such a distinction would be so unreasonable that we are unwilling to attribute to Congress a purpose to make it.” Panama R. Co. v. Johnson, 264 U. S. 375, 391.
Illustrative of the unbroken line of federal cases holding that persons working on ships for independent contractors or persons rightfully transacting business on ships can recover for damages due *414to shipowners’ negligence are: Leathers v. Blessing, 105 U. S. 626 (1882); The Max Morris, 137 U. S. 1 (1890); Gerrity v. The Bark Kate Cann, 2 F. 241 (1880); The Helios, 12 F. 732 (1882), decision by Judge Addison Brown; Grays Harbor Stevedore Co. v. Fountain, 5 F. 2d 385 (1925); Tide Water Associated Oil Co. v. Richardson, 169 F. 2d 802 (1948); Brady v. Roosevelt S. S. Co., 317 U. S. 575, 577 (1943). See also cases collected in 44 A. L. R. 1025-1034.