diff --git a/crypto777/OS_portable.h b/crypto777/OS_portable.h
index 5a66b5887..90ddda7c6 100755
--- a/crypto777/OS_portable.h
+++ b/crypto777/OS_portable.h
@@ -33,6 +33,7 @@
 #define sleep(x) Sleep(1000*(x))
 #include "../win/mingw.h"
 #include "../win/mman.h"
+#include "../win/pthread.h"
 
 //#define EADDRINUSE WSAEADDRINUSE