diff --git a/superset/db_engine_specs.py b/superset/db_engine_specs.py
index 2cf4891d73cf8..957da21194fee 100644
--- a/superset/db_engine_specs.py
+++ b/superset/db_engine_specs.py
@@ -104,7 +104,7 @@ def apply_limit_to_sql(cls, sql, limit, database):
             return database.compile_sqla_query(qry)
         elif LimitMethod.FORCE_LIMIT:
             no_limit = re.sub(r'(?i)\s+LIMIT\s+\d+;?(\s|;)*$', '', sql)
-            return "{no_limit} LIMIT {limit}".format(**locals())
+            return '{no_limit} LIMIT {limit}'.format(**locals())
         return sql
 
     @staticmethod