diff --git a/main.go b/main.go
index 66a30dd..f7c8aec 100644
--- a/main.go
+++ b/main.go
@@ -123,7 +123,7 @@ func main() {
 
 		// Authenticate.
 		if err := c.Auth(f.GetValue("field1"), f.GetValue("field2")); err != nil {
-			f.MakeInvalid("theoldpassword", "Invalid password")
+			f.MakeInvalid("field2", "Invalid password")
 			d.Body = f.Render(true)
 			tmpl.Execute(w, d)
 			return