diff --git a/pkgs/applications/virtualization/virt-manager/default.nix b/pkgs/applications/virtualization/virt-manager/default.nix
index dba0d11b425a..9df6967704af 100644
--- a/pkgs/applications/virtualization/virt-manager/default.nix
+++ b/pkgs/applications/virtualization/virt-manager/default.nix
@@ -52,7 +52,7 @@ buildPythonPackage rec {
             --prefix GIO_EXTRA_MODULES : "${dconf}/lib/gio/modules" \
             --prefix GSETTINGS_SCHEMA_DIR : $out/share/glib-2.0/schemas \
             --prefix LD_LIBRARY_PATH : ${gtk3}/lib/:${libvirt-glib}/lib/:${vte}/lib:${gtkvnc}/lib${optionalString spiceSupport ":${spice_gtk}/lib"} \
-            --prefix XDG_DATA_DIRS : "$out/share:${gsettings_desktop_schemas}/share:${gtk3}/share:\$XDG_DATA_DIRS"
+            --prefix XDG_DATA_DIRS : "$out/share:${gsettings_desktop_schemas}/share:${gtk3}/share:$GSETTINGS_SCHEMAS_PATH:\$XDG_DATA_DIRS"
     done
 
     ${glib}/bin/glib-compile-schemas "$out"/share/glib-2.0/schemas