diff --git a/glib/gbitlock.c b/glib/gbitlock.c
index 89e0071c5..e183d39cf 100644
--- a/glib/gbitlock.c
+++ b/glib/gbitlock.c
@@ -32,8 +32,8 @@
 
 #include "gthreadprivate.h"
 
-#undef HAVE_FUTEX
 #ifdef G_BIT_LOCK_FORCE_FUTEX_EMULATION
+#undef HAVE_FUTEX
 #endif
 
 #ifndef HAVE_FUTEX