diff --git a/pkgs/tools/X11/wmctrl/default.nix b/pkgs/tools/X11/wmctrl/default.nix
index 901eab0d1a6..f4705bdb0d4 100644
--- a/pkgs/tools/X11/wmctrl/default.nix
+++ b/pkgs/tools/X11/wmctrl/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://tomas.styblo.name/wmctrl/;
     description = "wmctrl is a UNIX/Linux command line tool to interact with an EWMH/NetWM compatible X Window Manager";
-    license = "GPL";
+    license = stdenv.lib.licenses.gpl2;
     platforms = with stdenv.lib.platforms; all;
   };
 }