diff --git a/src/core/util-private.h b/src/core/util-private.h
index 010de5831..ff9d7ce42 100644
--- a/src/core/util-private.h
+++ b/src/core/util-private.h
@@ -36,7 +36,10 @@
 
 void     meta_set_verbose (gboolean setting);
 void     meta_set_debugging (gboolean setting);
+
+META_EXPORT_TEST
 void     meta_set_syncing (gboolean setting);
+
 void     meta_set_replace_current_wm (gboolean setting);
 void     meta_set_is_wayland_compositor (gboolean setting);