diff --git a/glib/tests/relation.c b/glib/tests/relation.c
index f96890b2b..8caf4573a 100644
--- a/glib/tests/relation.c
+++ b/glib/tests/relation.c
@@ -22,7 +22,10 @@
  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  */
 
+/* we know we are deprecated here, no need for warnings */
+#ifndef GLIB_DISABLE_DEPRECATION_WARNINGS
 #define GLIB_DISABLE_DEPRECATION_WARNINGS
+#endif
 
 #include <glib.h>