Brian Campbell appeals after the District Court dismissed his pro se 42 U.S.C. § 1983 complaint for lack of subject matter jurisdiction. After careful review, we conclude that Campbell’s claim that he was arrested without probable cause established a basis for jurisdiction. See 28 U.S.C. § 1331 (“The district courts shall have original jurisdiction of all civil actions arising under the Constitution, laws, or treaties of the United States.”); 42 U.S.C. § 1983 (providing that every person acting under color of state law may be held liable for depriving another of constitutional rights); Hannah v. City of Overland, 795 F.2d 1385, 1389 (8th Cir. 1986) (“[A] war-rantless arrest without probable cause violates an individual’s constitutional rights under the Fourth and Fourteenth Amendments.”). Accordingly, we reverse the dismissal of Campbell’s complaint, and we remand the case to the District Court for further proceedings. We also grant Campbell’s pending motion for leave to appeal in forma pauperis.