diff --git a/src/base58.h b/src/base58.h
index d3967ec4e..9c6b54943 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -171,7 +171,7 @@ public:
 
     K GetKey() {
         K ret;
-        ret.Decode(&vchData[0], &vchData[Size]);
+        ret.Decode(&vchData[0]);
         return ret;
     }
 
@@ -179,6 +179,10 @@ public:
         SetKey(key);
     }
 
+    CBitcoinExtKeyBase(const std::string& strBase58c) {
+        SetString(strBase58c.c_str(), Params().Base58Prefix(Type).size());
+    }
+
     CBitcoinExtKeyBase() {}
 };