diff --git a/pkgs/development/python-modules/gst-python/default.nix b/pkgs/development/python-modules/gst-python/default.nix
index 9a4a19d5961..1333c4b59a4 100644
--- a/pkgs/development/python-modules/gst-python/default.nix
+++ b/pkgs/development/python-modules/gst-python/default.nix
@@ -24,9 +24,9 @@ stdenv.mkDerivation rec {
   # XXX: in the Libs.private field of python3.pc
   buildInputs = [ ncurses ];
 
-  preConfigure = ''
-    export configureFlags="$configureFlags --with-pygi-overrides-dir=$out/lib/${python.sitePackages}/gi/overrides"
-  '';
+  configureFlags = [
+    "--with-pygi-overrides-dir=$(out)/${python.sitePackages}/gi/overrides"
+  ];
 
   propagatedBuildInputs = [ gst-plugins-base pygobject3 ];