diff --git a/src/main.cpp b/src/main.cpp
index cfd6ac2c..bef76f73 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -503,7 +503,7 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
             return error("AcceptToMemoryPool() : transaction with out-of-bounds SigOpCount");
 
         // Don't accept it if it can't get into a block
-        if (nFees < GetMinFee(1000, true, true))
+        if (nFees < GetMinFee(1000, true, GMF_RELAY))
             return error("AcceptToMemoryPool() : not enough fees");
 
         // Continuously rate-limit free transactions
@@ -2959,7 +2959,7 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
 
             // Transaction fee required depends on block size
             bool fAllowFree = (nBlockSize + nTxSize < 4000 || CTransaction::AllowFree(dPriority));
-            int64 nMinFee = tx.GetMinFee(nBlockSize, fAllowFree, true);
+            int64 nMinFee = tx.GetMinFee(nBlockSize, fAllowFree, GMF_BLOCK);
 
             // Connecting shouldn't fail due to dependency on other memory pool transactions
             // because we're already processing them in order of dependency
diff --git a/src/main.h b/src/main.h
index 4543065d..d613d284 100644
--- a/src/main.h
+++ b/src/main.h
@@ -393,6 +393,13 @@ public:
 
 
 
+enum GetMinFee_mode
+{
+    GMF_BLOCK,
+    GMF_RELAY,
+    GMF_SEND,
+};
+
 //
 // The basic transaction that is broadcasted on the network and contained in
 // blocks.  A transaction can contain multiple inputs and outputs.
@@ -515,10 +522,10 @@ public:
         return dPriority > COIN * 144 / 250;
     }
 
-    int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true, bool fForRelay=false) const
+    int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true, enum GetMinFee_mode mode=GMF_BLOCK) const
     {
         // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
-        int64 nBaseFee = fForRelay ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
+        int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
 
         unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK);
         unsigned int nNewBlockSize = nBlockSize + nBytes;
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 53945284..c35081ce 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -1003,6 +1003,7 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
                 int64 nChange = nValueIn - nValue - nFeeRet;
                 // if sub-cent change is required, the fee must be raised to at least MIN_TX_FEE
                 // or until nChange becomes zero
+                // NOTE: this depends on the exact behaviour of GetMinFee
                 if (nFeeRet < MIN_TX_FEE && nChange > 0 && nChange < CENT)
                 {
                     int64 nMoveToFee = min(nChange, MIN_TX_FEE - nFeeRet);
@@ -1055,7 +1056,7 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
                 // Check that enough fee is included
                 int64 nPayFee = nTransactionFee * (1 + (int64)nBytes / 1000);
                 bool fAllowFree = CTransaction::AllowFree(dPriority);
-                int64 nMinFee = wtxNew.GetMinFee(1, fAllowFree);
+                int64 nMinFee = wtxNew.GetMinFee(1, fAllowFree, GMF_SEND);
                 if (nFeeRet < max(nPayFee, nMinFee))
                 {
                     nFeeRet = max(nPayFee, nMinFee);