diff --git a/pkgs/development/tools/flock/default.nix b/pkgs/development/tools/flock/default.nix
index d55c964d2fc4..7b6aadc47161 100644
--- a/pkgs/development/tools/flock/default.nix
+++ b/pkgs/development/tools/flock/default.nix
@@ -24,6 +24,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Cross-platform version of flock(1)";
     maintainers = with maintainers; [ matthewbauer msfjarvis ];
+    mainProgram = "flock";
     platforms = platforms.all;
     license = licenses.isc;
   };