diff --git a/src/masternode-payments.cpp b/src/masternode-payments.cpp
index d29f1fc8a..18107be1f 100644
--- a/src/masternode-payments.cpp
+++ b/src/masternode-payments.cpp
@@ -378,6 +378,11 @@ void CMasternodePayments::ProcessMessageMasternodePayments(CNode* pfrom, std::st
             return;
         }
 
+        if(!masternodePayments.CanVote(winner.vinMasternode.prevout, winner.nBlockHeight)){
+            LogPrintf("mnw - masternode already voted - %s\n", winner.vinMasternode.prevout.ToStringShort());
+            return;
+        }
+
         if(!winner.SignatureValid()){
             LogPrintf("mnw - invalid signature\n");
             Misbehaving(pfrom->GetId(), 100);
@@ -388,7 +393,7 @@ void CMasternodePayments::ProcessMessageMasternodePayments(CNode* pfrom, std::st
         ExtractDestination(winner.payee, address1);
         CBitcoinAddress address2(address1);
 
-        if(fDebug) LogPrintf("mnw - winning vote - Addr %s Height %d bestHeight %d\n", address2.ToString().c_str(), winner.nBlockHeight, chainActive.Tip()->nHeight);
+        if(fDebug) LogPrintf("mnw - winning vote - Addr %s Height %d bestHeight %d - %s\n", address2.ToString().c_str(), winner.nBlockHeight, chainActive.Tip()->nHeight, winner.vinMasternode.prevout.ToStringShort());
 
         if(masternodePayments.AddWinningMasternode(winner)){
             winner.Relay();
diff --git a/src/masternode-payments.h b/src/masternode-payments.h
index 7afb0472a..f7939c7ca 100644
--- a/src/masternode-payments.h
+++ b/src/masternode-payments.h
@@ -181,6 +181,7 @@ public:
         payee = payeeIn;
     }
 
+
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
@@ -216,6 +217,7 @@ private:
 public:
     std::map<uint256, CMasternodePaymentWinner> mapMasternodePayeeVotes;
     std::map<int, CMasternodeBlockPayees> mapMasternodeBlocks;
+    std::map<uint256, int> mapMasternodesLastVote; //prevout.hash + prevout.n, nBlockHeight
 
     CMasternodePayments() {
         nSyncedFromPeer = 0;
@@ -238,6 +240,18 @@ public:
     bool IsTransactionValid(const CTransaction& txNew, int nBlockHeight);
     bool IsScheduled(CMasternode& mn, int nNotBlockHeight);
 
+    bool CanVote(COutPoint outMasternode, int nBlockHeight) {
+        if(mapMasternodesLastVote.count(outMasternode.hash + outMasternode.n)) {
+            if(mapMasternodesLastVote[outMasternode.hash + outMasternode.n] == nBlockHeight) {
+                return false;
+            }
+        }
+
+        //record this masternode voted
+        mapMasternodesLastVote[outMasternode.hash + outMasternode.n] = nBlockHeight;
+        return true;
+    }
+
     int GetMinMasternodePaymentsProto();
     void ProcessMessageMasternodePayments(CNode* pfrom, std::string& strCommand, CDataStream& vRecv);
     std::string GetRequiredPaymentsString(int nBlockHeight);