diff --git a/src/univalue/univalue.cpp b/src/univalue/univalue.cpp
index afc208bffb9..b0171e48c41 100644
--- a/src/univalue/univalue.cpp
+++ b/src/univalue/univalue.cpp
@@ -44,7 +44,7 @@ static bool validNumStr(const string& s)
 
 bool UniValue::setNumStr(const string& val_)
 {
-    if (!validNumStr(val))
+    if (!validNumStr(val_))
         return false;
 
     clear();