diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index b8e9ad311..05b7c9c55 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2387,6 +2387,10 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int
 bool CWallet::SelectCoins(const CAmount& nTargetValue, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet,  bool& fOnlyCoinbaseCoinsRet, bool& fNeedCoinbaseCoinsRet, const CCoinControl* coinControl,uint64_t *interestp) const
 {
     // Output parameter fOnlyCoinbaseCoinsRet is set to true when the only available coins are coinbase utxos.
+    uint64_t tmp;
+    if ( interestp == 0 )
+        interestp = &tmp;
+    *interestp = 0;
     vector<COutput> vCoinsNoCoinbase, vCoinsWithCoinbase;
     AvailableCoins(vCoinsNoCoinbase, true, coinControl, false, false);
     AvailableCoins(vCoinsWithCoinbase, true, coinControl, false, true);
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 2163c246a..8dee91cf7 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -575,7 +575,7 @@ public:
 class CWallet : public CCryptoKeyStore, public CValidationInterface
 {
 private:
-    bool SelectCoins(const CAmount& nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet, bool& fOnlyCoinbaseCoinsRet, bool& fNeedCoinbaseCoinsRet, const CCoinControl *coinControl = NULL,uint64_t *interestp) const;
+    bool SelectCoins(const CAmount& nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet, bool& fOnlyCoinbaseCoinsRet, bool& fNeedCoinbaseCoinsRet, const CCoinControl *coinControl = NULL,uint64_t *interestp = NULL) const;
 
     CWalletDB *pwalletdbEncryption;