diff --git a/superset/db_engine_specs.py b/superset/db_engine_specs.py
index 497e476bc58b3..6b9efc3bcd421 100644
--- a/superset/db_engine_specs.py
+++ b/superset/db_engine_specs.py
@@ -193,7 +193,7 @@ class SqliteEngineSpec(BaseEngineSpec):
         Grain("week", _('week'),
               "DATE({col}, -strftime('%w', {col}) || ' days')"),
         Grain("month", _('month'),
-              "DATE({col}, -strftime('%d', {col}) || ' days')"),
+              "DATE({col}, -strftime('%d', {col}) || ' days', '+1 day')"),
     )
 
     @classmethod