diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index d53ddd09f..f3bfc2668 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -453,7 +453,7 @@ UniValue getrawtransaction(const UniValue& params, bool fHelp, const CPubKey& my
         return strHex;
 
     UniValue result(UniValue::VOBJ);
-    unsigned int serializeSize = GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
+    int serializeSize = GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
     
     result.push_back(Pair("hex", strHex));
     result.push_back(Pair("size", serializeSize));