diff --git a/src/NetworkSyncManager.cpp b/src/NetworkSyncManager.cpp
index 303578235f..b49720a46a 100644
--- a/src/NetworkSyncManager.cpp
+++ b/src/NetworkSyncManager.cpp
@@ -2,6 +2,7 @@
 #include "NetworkSyncManager.h"
 #include "LuaManager.h"
 #include "LocalizedString.h"
+#include <errno.h>
 
 NetworkSyncManager *NSMAN;