diff --git a/hw/xquartz/mach-startup/bundle-main.c b/hw/xquartz/mach-startup/bundle-main.c
index 456c44f76f..61604ed290 100644
--- a/hw/xquartz/mach-startup/bundle-main.c
+++ b/hw/xquartz/mach-startup/bundle-main.c
@@ -59,6 +59,8 @@
 
 #ifdef HAS_LIBDISPATCH
 #include <dispatch/dispatch.h>
+#else
+#include <pthread.h>
 #endif
 
 #include <asl.h>