diff --git a/mongoose.c b/mongoose.c
index aa74d0b2..b0be81c6 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -81,6 +81,7 @@
 #ifdef _MSC_VER
 #pragma comment(lib, "ws2_32.lib")    // Linking with winsock library
 #endif
+#include <Ws2tcpip.h>
 #include <windows.h>
 #include <process.h>
 #ifndef EINPROGRESS