diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index f76c4605db..5d0f3d515c 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -296,6 +296,7 @@ smgrrelease(SMgrRelation reln)
 		smgrsw[reln->smgr_which].smgr_close(reln, forknum);
 		reln->smgr_cached_nblocks[forknum] = InvalidBlockNumber;
 	}
+	reln->smgr_targblock = InvalidBlockNumber;
 }
 
 /*