diff --git a/src/base58.cpp b/src/base58.cpp
index 5e26cf8d4..d59d459e0 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -172,7 +172,7 @@ bool CBase58Data::SetString(const char* psz, unsigned int nVersionBytes)
     vchData.resize(vchTemp.size() - nVersionBytes);
     if (!vchData.empty())
         memcpy(&vchData[0], &vchTemp[nVersionBytes], vchData.size());
-    memory_cleanse(&vchTemp[0], vchData.size());
+    memory_cleanse(&vchTemp[0], vchTemp.size());
     return true;
 }