diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 03c0b739b3..84818bbb4e 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -3355,6 +3355,7 @@ AlterTableInternal(Oid relid, List *cmds, bool recurse)
 
 	rel = relation_open(relid, lockmode);
 
+	EventTriggerAlterTableStart(NULL);
 	EventTriggerAlterTableRelid(relid);
 
 	ATController(NULL, rel, cmds, recurse, lockmode);