diff --git a/src/local.h b/src/local.h
index 411273bb..67161781 100644
--- a/src/local.h
+++ b/src/local.h
@@ -31,7 +31,7 @@
 #include <ev.h>
 #endif
 
-#ifdef TCP_FASTOPEN_WINSOCK
+#ifdef __MINGW32__
 #include "winsock.h"
 #endif
 
diff --git a/src/server.h b/src/server.h
index 2daed0f3..5233a4e8 100644
--- a/src/server.h
+++ b/src/server.h
@@ -32,7 +32,7 @@
 #include <ev.h>
 #endif
 
-#ifdef TCP_FASTOPEN_WINSOCK
+#ifdef __MINGW32__
 #include "winsock.h"
 #endif