diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 193ade4002..a6e4a16d14 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2558,7 +2558,7 @@ void CWallet::AvailableCoins(std::vector<COutput>& vCoins, bool fOnlySafe, const
     }
 }
 
-static void ApproximateBestSubset(std::vector<std::pair<CAmount, std::pair<const CWalletTx*,unsigned int> > >vValue, const CAmount& nTotalLower, const CAmount& nTargetValue,
+static void ApproximateBestSubset(const std::vector<std::pair<CAmount, std::pair<const CWalletTx*,unsigned int> > >& vValue, const CAmount& nTotalLower, const CAmount& nTargetValue,
                                   std::vector<char>& vfBest, CAmount& nBest, bool fUseInstantSend = false, int iterations = 1000)
 {
     std::vector<char> vfIncluded;
@@ -4011,7 +4011,7 @@ bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
 
 /**
  * Mark old keypool keys as used,
- * and generate all new keys 
+ * and generate all new keys
  */
 bool CWallet::NewKeyPool()
 {