diff --git a/deps/portal/src/Protocol.cpp b/deps/portal/src/Protocol.cpp
index f91b948..07bdba2 100644
--- a/deps/portal/src/Protocol.cpp
+++ b/deps/portal/src/Protocol.cpp
@@ -24,6 +24,9 @@
 #endif
 
 #include "Protocol.hpp"
+#ifndef ntohl
+#include <netinet/in.h>
+#endif
 
 namespace portal {