diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 7fe8f216..5d38f042 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -1561,7 +1561,7 @@ void ThreadCleanWalletPassphrase(void* parg)
             if (nWalletUnlockTime < nMyWakeTime)
                 nWalletUnlockTime = nMyWakeTime;
         }
-        free(parg);
+        delete (int*)parg;
         return;
     }