diff --git a/src/backend/access/nbtree/nbtdedup.c b/src/backend/access/nbtree/nbtdedup.c
index 3e11805293a..0207421a5d9 100644
--- a/src/backend/access/nbtree/nbtdedup.c
+++ b/src/backend/access/nbtree/nbtdedup.c
@@ -65,7 +65,7 @@ _bt_dedup_pass(Relation rel, Buffer buf, Relation heapRel, IndexTuple newitem,
 	BTPageOpaque opaque = BTPageGetOpaque(page);
 	Page		newpage;
 	BTDedupState state;
-	Size		pagesaving = 0;
+	Size		pagesaving PG_USED_FOR_ASSERTS_ONLY = 0;
 	bool		singlevalstrat = false;
 	int			nkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);