diff --git a/steam-runtime-tools/glib-compat.h b/steam-runtime-tools/glib-compat.h
index 51e3b08825a2d8ce3ac23c54b77c9a2daddf298f..8be74ceb731e7afe6064818d3ebee84ee4c4a2bc 100644
--- a/steam-runtime-tools/glib-compat.h
+++ b/steam-runtime-tools/glib-compat.h
@@ -1,3 +1,4 @@
+/*<private_header>*/
 /*
  * Copyright © 2019 Collabora Ltd.
  *