diff --git a/pkgs/development/libraries/glib-networking/default.nix b/pkgs/development/libraries/glib-networking/default.nix
index 780ed5e592f..c2eae0a7e70 100644
--- a/pkgs/development/libraries/glib-networking/default.nix
+++ b/pkgs/development/libraries/glib-networking/default.nix
@@ -22,8 +22,6 @@ stdenv.mkDerivation rec {
     sha256 = "1mfw44qpmwvz6yzj8c6spx6z357wrmkk15byrkc5byagd82860fm";
   };
 
-  PKG_CONFIG_GIO_2_0_GIOMODULEDIR = "${placeholder "out"}/lib/gio/modules";
-
   postPatch = ''
     chmod +x meson_post_install.py # patchShebangs requires executable file
     patchShebangs meson_post_install.py