diff --git a/src/netbase.h b/src/netbase.h
index 5bf13a673..b42c2dffa 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -162,7 +162,7 @@ class CService : public CNetAddr
         inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
             READWRITE(FLATDATA(ip));
             unsigned short portN = htons(port);
-            READWRITE(portN);
+            READWRITE(FLATDATA(portN));
             if (ser_action.ForRead())
                  port = ntohs(portN);
         }