diff --git a/pkgs/applications/misc/multimon-ng/default.nix b/pkgs/applications/misc/multimon-ng/default.nix
index a9f0cb2511a..8e39c258333 100644
--- a/pkgs/applications/misc/multimon-ng/default.nix
+++ b/pkgs/applications/misc/multimon-ng/default.nix
@@ -16,6 +16,8 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ qmake4Hook ];
 
+  qmakeFlags = [ "multimon-ng.pro" ];
+
   installPhase = ''
     mkdir -p $out/bin
     cp multimon-ng $out/bin