diff --git a/testsuite/css/performance/meson.build b/testsuite/css/performance/meson.build
index afceb45d26..781b1b3658 100644
--- a/testsuite/css/performance/meson.build
+++ b/testsuite/css/performance/meson.build
@@ -4,6 +4,7 @@ if get_option ('profiler')
 
   test('performance', test_css_performance,
        args: [ join_paths(meson.current_build_dir(), '../../../demos/widget-factory/gtk4-widget-factory') ],
-       env: [ 'GTK_THEME=Adwaita' ],
+       env: [ 'GTK_THEME=Adwaita',
+              'GSETTINGS_SCHEMA_DIR=@0@'.format(gtk_schema_build_dir) ],
        suite: [ 'css' ])
 endif