diff --git a/hstest/stage/sql_test.py b/hstest/stage/sql_test.py
index 03d324e8..dbd5b43c 100644
--- a/hstest/stage/sql_test.py
+++ b/hstest/stage/sql_test.py
@@ -20,7 +20,7 @@ def execute(self, query_name: str):
         try:
             return cursor.execute(self.queries[query_name])
         except Exception as ex:
-            raise WrongAnswer(f"Error while running '{query_name}': \n\n{str(ex)}")
+            raise WrongAnswer(f"Error while running '{query_name}': \n\n{ex}")
 
     def execute_and_fetch_all(self, query_name: str):
         return self.execute(query_name).fetchall()