diff --git a/lib/sync.c b/lib/sync.c
index f949d58..3fbe90b 100644
--- a/lib/sync.c
+++ b/lib/sync.c
@@ -17,6 +17,7 @@
 
 #if defined(WIN32)
 #include <winsock2.h>
+#include "win32/win32_compat.h"
 #else
 #include <poll.h>
 #endif