diff --git a/pkgs/development/libraries/gdk-pixbuf/default.nix b/pkgs/development/libraries/gdk-pixbuf/default.nix
index 94536f8f5b6..3fb50e98c1c 100644
--- a/pkgs/development/libraries/gdk-pixbuf/default.nix
+++ b/pkgs/development/libraries/gdk-pixbuf/default.nix
@@ -116,6 +116,7 @@ stdenv.mkDerivation rec {
     description = "A library for image loading and manipulation";
     homepage = http://library.gnome.org/devel/gdk-pixbuf/;
     maintainers = [ maintainers.eelco ];
+    license = licenses.lgpl21;
     platforms = platforms.unix;
   };
 }