diff --git a/WizardMath/inference/util.py b/WizardMath/inference/util.py
index da2b714..52bfee6 100644
--- a/WizardMath/inference/util.py
+++ b/WizardMath/inference/util.py
@@ -245,7 +245,7 @@ def is_equiv(str1, str2, verbose=False):
         return res
     except Exception:
         #return str1 == str2
-        res = math_equal(str1,str1) or str1 == str2
+        res = math_equal(str1,str2) or str1 == str2
         return res
 
 class NotEqual: