diff --git a/sdk/storage/azure-storage-blob/azure/storage/blob/_blob_client.py b/sdk/storage/azure-storage-blob/azure/storage/blob/_blob_client.py
index 6ec2fd469fbc..e3a659f9c867 100644
--- a/sdk/storage/azure-storage-blob/azure/storage/blob/_blob_client.py
+++ b/sdk/storage/azure-storage-blob/azure/storage/blob/_blob_client.py
@@ -967,8 +967,8 @@ def query_blob(self, query_expression, **kwargs):
             error_cls=error_cls)
 
     @staticmethod
-    def _generic_delete_blob_options(delete_snapshots=False, **kwargs):
-        # type: (bool, **Any) -> Dict[str, Any]
+    def _generic_delete_blob_options(delete_snapshots=None, **kwargs):
+        # type: (str, **Any) -> Dict[str, Any]
         access_conditions = get_access_conditions(kwargs.pop('lease', None))
         mod_conditions = get_modify_conditions(kwargs)
         if delete_snapshots:
@@ -982,8 +982,8 @@ def _generic_delete_blob_options(delete_snapshots=False, **kwargs):
         options.update(kwargs)
         return options
 
-    def _delete_blob_options(self, delete_snapshots=False, **kwargs):
-        # type: (bool, **Any) -> Dict[str, Any]
+    def _delete_blob_options(self, delete_snapshots=None, **kwargs):
+        # type: (str, **Any) -> Dict[str, Any]
         if self.snapshot and delete_snapshots:
             raise ValueError("The delete_snapshots option cannot be used with a specific snapshot.")
         options = self._generic_delete_blob_options(delete_snapshots, **kwargs)