diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 0053832..c4f0bb5 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -369,11 +369,6 @@ DefineIndex(Oid relationId,
 	Snapshot	snapshot;
 	int			i;
 
-	if (list_intersection(stmt->indexParams, stmt->indexIncludingParams) != NIL)
-		ereport(ERROR,
-				(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
-				 errmsg("included columns must not intersect with key columns")));
-
 	/*
 	 * count key attributes in index
 	 */