diff --git a/src/backend/replication/slotfuncs.c b/src/backend/replication/slotfuncs.c
index 06e4955de7..bc3fcbff4d 100644
--- a/src/backend/replication/slotfuncs.c
+++ b/src/backend/replication/slotfuncs.c
@@ -723,12 +723,9 @@ copy_replication_slot(FunctionCallInfo fcinfo, bool logical_slot)
 
 	/* Copying non-reserved slot doesn't make sense */
 	if (XLogRecPtrIsInvalid(src_restart_lsn))
-	{
-		Assert(!logical_slot);
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("cannot copy a replication slot that doesn't reserve WAL")));
-	}
 
 	/* Overwrite params from optional arguments */
 	if (PG_NARGS() >= 3)