diff --git a/pkgs/applications/audio/gst123/default.nix b/pkgs/applications/audio/gst123/default.nix
index 7262755b80d7..f6f4d11ca705 100644
--- a/pkgs/applications/audio/gst123/default.nix
+++ b/pkgs/applications/audio/gst123/default.nix
@@ -44,6 +44,7 @@ stdenv.mkDerivation (finalAttrs: {
     description = "GStreamer based command line media player";
     homepage = "https://space.twc.de/~stefan/gst123.php";
     license = licenses.lgpl2Plus;
+    mainProgram = "gst123";
     maintainers = with maintainers; [ swesterfeld ];
     inherit (ncurses.meta) platforms;
     broken = stdenv.isDarwin;