diff --git a/src/wallet.cpp b/src/wallet.cpp
index feeee86ce..8fab1f08b 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -591,7 +591,7 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet)
 bool CWallet::AddToWalletIfInvolvingMe(const uint256 &hash, const CTransaction& tx, const CBlock* pblock, bool fUpdate)
 {
     {
-        LOCK(cs_wallet);
+        AssertLockHeld(cs_wallet);
         bool fExisted = mapWallet.count(hash);
         if (fExisted && !fUpdate) return false;
         if (fExisted || IsMine(tx) || IsFromMe(tx))
@@ -608,9 +608,8 @@ bool CWallet::AddToWalletIfInvolvingMe(const uint256 &hash, const CTransaction&
 
 void CWallet::SyncTransaction(const uint256 &hash, const CTransaction& tx, const CBlock* pblock)
 {
-    AddToWalletIfInvolvingMe(hash, tx, pblock, true);
-
-    if (mapWallet.count(hash) == 0)
+    LOCK(cs_wallet);
+    if (!AddToWalletIfInvolvingMe(hash, tx, pblock, true))
         return; // Not one of ours
 
     // If a transaction changes 'conflicted' state, that changes the balance