diff --git a/src/backend/access/index/indexam.c b/src/backend/access/index/indexam.c
index dc303995e5..fc419fd8e6 100644
--- a/src/backend/access/index/indexam.c
+++ b/src/backend/access/index/indexam.c
@@ -209,8 +209,6 @@ index_beginscan(Relation heapRelation,
 {
 	IndexScanDesc scan;
 
-	Assert(snapshot != InvalidSnapshot);
-
 	scan = index_beginscan_internal(indexRelation, nkeys, norderbys, snapshot, NULL, false);
 
 	/*
@@ -239,8 +237,6 @@ index_beginscan_bitmap(Relation indexRelation,
 {
 	IndexScanDesc scan;
 
-	Assert(snapshot != InvalidSnapshot);
-
 	scan = index_beginscan_internal(indexRelation, nkeys, 0, snapshot, NULL, false);
 
 	/*
@@ -265,6 +261,8 @@ index_beginscan_internal(Relation indexRelation,
 	RELATION_CHECKS;
 	CHECK_REL_PROCEDURE(ambeginscan);
 
+	Assert(snapshot != InvalidSnapshot);
+
 	if (!(indexRelation->rd_indam->ampredlocks))
 		PredicateLockRelation(indexRelation, snapshot);