diff --git a/test/test-utils-glib.h b/test/test-utils-glib.h
index c4a2c543..ee642033 100644
--- a/test/test-utils-glib.h
+++ b/test/test-utils-glib.h
@@ -127,7 +127,7 @@ backported_g_steal_pointer (gpointer pointer_to_pointer)
 #endif
 
 #ifndef g_assert_nonnull
-#define g_assert_nonnull(a) g_assert (a != NULL)
+#define g_assert_nonnull(a) g_assert ((a) != NULL)
 #endif
 
 gboolean test_check_tcp_works (void);