diff --git a/pkgs/tools/graphics/pngquant/default.nix b/pkgs/tools/graphics/pngquant/default.nix
index 908ad26fa6a6..9a33e4282b2f 100644
--- a/pkgs/tools/graphics/pngquant/default.nix
+++ b/pkgs/tools/graphics/pngquant/default.nix
@@ -27,6 +27,7 @@ stdenv.mkDerivation rec {
     changelog = "https://github.com/kornelski/pngquant/raw/${version}/CHANGELOG";
     platforms = platforms.unix;
     license = with licenses; [ gpl3Plus hpnd bsd2 ];
+    mainProgram = "pngquant";
     maintainers = [ maintainers.srapenne ];
   };
 }