diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 8326fe14d..d06a9142b 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -89,7 +89,8 @@ void RPCTypeCheck(const UniValue& params,
 
 void RPCTypeCheckObj(const UniValue& o,
                   const map<string, UniValue::VType>& typesExpected,
-                  bool fAllowNull)
+                  bool fAllowNull,
+                  bool fStrict)
 {
     BOOST_FOREACH(const PAIRTYPE(string, UniValue::VType)& t, typesExpected)
     {
@@ -104,6 +105,18 @@ void RPCTypeCheckObj(const UniValue& o,
             throw JSONRPCError(RPC_TYPE_ERROR, err);
         }
     }
+
+    if (fStrict)
+    {
+        BOOST_FOREACH(const string& k, o.getKeys())
+        {
+            if (typesExpected.count(k) == 0)
+            {
+                string err = strprintf("Unexpected key %s", k);
+                throw JSONRPCError(RPC_TYPE_ERROR, err);
+            }
+        }
+    }
 }
 
 CAmount AmountFromValue(const UniValue& value)
diff --git a/src/rpc/server.h b/src/rpc/server.h
index a7ed710ce..b47133661 100644
--- a/src/rpc/server.h
+++ b/src/rpc/server.h
@@ -70,7 +70,7 @@ void RPCTypeCheck(const UniValue& params,
   Use like: RPCTypeCheckObj(object, boost::assign::map_list_of("name", str_type)("value", int_type));
 */
 void RPCTypeCheckObj(const UniValue& o,
-                  const std::map<std::string, UniValue::VType>& typesExpected, bool fAllowNull=false);
+                  const std::map<std::string, UniValue::VType>& typesExpected, bool fAllowNull=false, bool fStrict=false);
 
 /** Opaque base class for timers returned by NewTimerFunc.
  * This provides no methods at the moment, but makes sure that delete