diff --git a/AzureSQLMaintenance.txt b/AzureSQLMaintenance.txt
index 14487ac..abe9f5f 100644
--- a/AzureSQLMaintenance.txt
+++ b/AzureSQLMaintenance.txt
@@ -243,7 +243,8 @@ begin
 		and (alloc_unit_type_desc = 'IN_ROW_DATA' /*avoid LOB_DATA or ROW_OVERFLOW_DATA*/ or alloc_unit_type_desc is null /*for ColumnStore indexes*/)
 		and OBJECT_SCHEMA_NAME(idxs.object_id) != 'sys'
 		and idxs.is_disabled=0
-		and obj.type_desc != 'TF' /* Ignore table value functions */
+		and obj.type <> 'TF' /* Ignore table value functions */
+		and not exists ( select * from sys.external_tables as et where et.object_id = obj.object_id )
 		order by i.avg_fragmentation_in_percent desc, i.page_count desc
 				
 		-- mark indexes XML,spatial and columnstore not to run online update