diff --git a/saturn/default.nix b/saturn/default.nix
index 1ae008f..ff8b4ce 100644
--- a/saturn/default.nix
+++ b/saturn/default.nix
@@ -54,7 +54,6 @@ in stdenv.mkDerivation {
   # This makes a big difference to how many icons are displayed on
   # my machine
   postInstall = ''
-    echo  $GI_TYPELIB_PATH
-    wrapProgram $out/bin/saturn --prefix GDK_PIXBUF_MODULE_FILE : ${librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH"
+    wrapProgram $out/bin/saturn --set GDK_PIXBUF_MODULE_FILE ${librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache --set GI_TYPELIB_PATH "$GI_TYPELIB_PATH"
   '';
 }