diff --git a/pkgs/by-name/gi/gitoxide/package.nix b/pkgs/by-name/gi/gitoxide/package.nix
index 5a0539dc2933..d5b49da99050 100644
--- a/pkgs/by-name/gi/gitoxide/package.nix
+++ b/pkgs/by-name/gi/gitoxide/package.nix
@@ -61,5 +61,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
       asl20
     ];
     maintainers = with lib.maintainers; [ syberant ];
+    # NB: `ein` is also provided by this package, but `nix run
+    # nixpkgs#gitoxide` doesn't work at all without this set.
+    mainProgram = "gix";
   };
 })