diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 1896a9a06d1..a1bc0717567 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -538,6 +538,7 @@ typedef struct ViewOptions
 	(RELKIND_HAS_STORAGE((relation)->rd_rel->relkind) && \
 	 ((relation)->rd_rel->relfilenode == InvalidOid))
 
+#ifndef FRONTEND
 /*
  * RelationGetSmgr
  *		Returns smgr file handle for a relation, opening it if needed.
@@ -558,6 +559,7 @@ RelationGetSmgr(Relation rel)
 		smgrsetowner(&(rel->rd_smgr), smgropen(rel->rd_node, rel->rd_backend));
 	return rel->rd_smgr;
 }
+#endif							/* !FRONTEND */
 
 /*
  * RelationCloseSmgr
diff --git a/src/include/utils/snapmgr.h b/src/include/utils/snapmgr.h
index 67b217b1c11..06eafdf118a 100644
--- a/src/include/utils/snapmgr.h
+++ b/src/include/utils/snapmgr.h
@@ -97,11 +97,13 @@ extern PGDLLIMPORT SnapshotData CatalogSnapshotData;
 	((snapshot)->snapshot_type == SNAPSHOT_MVCC || \
 	 (snapshot)->snapshot_type == SNAPSHOT_HISTORIC_MVCC)
 
+#ifndef FRONTEND
 static inline bool
 OldSnapshotThresholdActive(void)
 {
 	return old_snapshot_threshold >= 0;
 }
+#endif
 
 extern Snapshot GetTransactionSnapshot(void);
 extern Snapshot GetLatestSnapshot(void);