ORDER

Defendant Bruce Trucking Company by Motion seeks to join United States Fidelity & Guaranty Company herein as an additional party plaintiff claiming that it is subrogated as a matter of Oklahoma law to a portion of Plaintiff’s action by reason of payments made to Plaintiff under a workmen’s compensation insurance policy. Plaintiff opposes said Motion on the ground that recent Oklahoma decisions have ruled that the anti-assignment portion of 12 Okl.St.Ann. § 221 prohibits action by *488an insurer-subrogee against the injured party’s tortfeasor with respect to medical payments under automobile policies.1 It is clear that these cases are inapplicable to the case at bar. They apply by their own terms to medical pay provisions in automobile liability policies, not workmen’s compensation policies. Moreover, there is direct statutory authority for subrogation of a workmen’s compensation insurer, 85 Okl.St.Ann. § 44(a), and both the Oklahoma Supreme Court and our Court of Appeals have recognized the subrogation rights of such an insurer. Travelers Insurance Co. v. Leedy, 450 P.2d 898 (Okl. 1969); White Motor Corporation v. Stewart, 465 F.2d 1085 (10 Cir. 1972); Oklahoma Natural Gas Co. v. Mid-Continent Casualty Co., 268 F.2d 508 (10 Cir. 1959). Thus, there exists in the law of Oklahoma a substantive right under state law for a workmen’s compensation insurer to proceed against and recover its interest in its insured’s claim against the tortfeasor. 85 Okl.St.Ann. § 44(a) and cases cited above.2 Therefore, under Rule 17(a), F.R.Civ.P., such an insurer is a real party in interest and must be joined on timely motion of a Defendant. Gas Service Company v. Hunt, 183 F.2d 417 (10 Cir. 1950); Public Service Company of Oklahoma, et al. v. Black & Veatch, 467 F.2d 1143 (10 Cir. 1972).

For reasons set out above, United States Fidelity & Guaranty Company should be made an additional party plaintiff herein. The above-named Defendant may take appropriate action to cause said additional party plaintiff to be brought into this action. Upon this being accomplished, said additional party plaintiff herein shall either file its own Complaint herein or adopt the Complaint of the original Plaintiff. When either is accomplished Defendants will answer thereto within ten (10) days thereafter.