diff --git a/pkgs/desktops/gnome-3/extensions/gsconnect/default.nix b/pkgs/desktops/gnome-3/extensions/gsconnect/default.nix
index e1735476c1ec..cff0db665bba 100644
--- a/pkgs/desktops/gnome-3/extensions/gsconnect/default.nix
+++ b/pkgs/desktops/gnome-3/extensions/gsconnect/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     (substituteAll {
       src = ./fix-paths.patch;
       gapplication = "${glib.bin}/bin/gapplication";
-      mutter_gsettings_path = "${glib.getSchemaPath gnome3.mutter}";
+      mutter_gsettings_path = glib.getSchemaPath gnome3.mutter;
     })
   ];
 
diff --git a/pkgs/desktops/gnome-3/misc/gpaste/default.nix b/pkgs/desktops/gnome-3/misc/gpaste/default.nix
index 1738c24017c0..46ca01c1a1a1 100644
--- a/pkgs/desktops/gnome-3/misc/gpaste/default.nix
+++ b/pkgs/desktops/gnome-3/misc/gpaste/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
     substituteInPlace src/gnome-shell/prefs.js \
       --subst-var-by typelibPath "${placeholder "out"}/lib/girepository-1.0"
     substituteInPlace src/libgpaste/settings/gpaste-settings.c \
-      --subst-var-by gschemasCompiled ${glib.makeSchemaPath "$out" "${pname}-${version}"}
+      --subst-var-by gschemasCompiled ${glib.makeSchemaPath (placeholder "out") "${pname}-${version}"}
   '';
 
   nativeBuildInputs = [