diff --git a/hw/xwin/winglobals.h b/hw/xwin/winglobals.h
index e7e2f7e201..4faba9eb7c 100644
--- a/hw/xwin/winglobals.h
+++ b/hw/xwin/winglobals.h
@@ -30,6 +30,8 @@
 #include <xwin-config.h>
 #endif
 
+#include <pthread.h>
+
 /*
  * References to external symbols
  */