diff --git a/pkgs/tools/text/colordiff/default.nix b/pkgs/tools/text/colordiff/default.nix
index 4146429e2839..69473bd2c6f6 100644
--- a/pkgs/tools/text/colordiff/default.nix
+++ b/pkgs/tools/text/colordiff/default.nix
@@ -35,5 +35,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2Plus;
     platforms = platforms.unix;
     maintainers = with maintainers; [ SuperSandro2000 ];
+    mainProgram = "colordiff";
   };
 }