diff --git a/source/common/jscore.cpp b/source/common/jscore.cpp
index 2b2676a..2829864 100644
--- a/source/common/jscore.cpp
+++ b/source/common/jscore.cpp
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
-#ifdef WIN32
+#ifdef _WIN32
     #include <winsock2.h>
 #else
     #include <sys/socket.h>