diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 8c55f16f83..6ddcfda0a6 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -432,6 +432,7 @@ revmap_physical_extend(BrinRevmap *revmap)
 			if (needLock)
 				UnlockRelationForExtension(irel, ExclusiveLock);
 			LockBuffer(revmap->rm_metaBuf, BUFFER_LOCK_UNLOCK);
+			ReleaseBuffer(buf);
 			return;
 		}
 		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);