diff --git a/src/core/libraries/network/net_epoll.h b/src/core/libraries/network/net_epoll.h
index bccb4ba25..9c778e68e 100644
--- a/src/core/libraries/network/net_epoll.h
+++ b/src/core/libraries/network/net_epoll.h
@@ -14,6 +14,7 @@
 
 #ifdef _WIN32
 #include <wepoll.h>
+#include <winsock2.h>
 #endif
 
 // TODO: FreeBSD requires libepoll-shim for epoll support