diff --git a/gthread/tests/1bit-mutex.c b/gthread/tests/1bit-mutex.c
index dff095ca9..abb6ddfe7 100644
--- a/gthread/tests/1bit-mutex.c
+++ b/gthread/tests/1bit-mutex.c
@@ -26,7 +26,9 @@
    */
 
   /* side-step some glib build stuff */
+  #ifndef DISABLE_VISIBILITY
   #define DISABLE_VISIBILITY
+  #endif
   #define GLIB_COMPILATION
 
   /* rebuild gbitlock.c without futex support,