diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 330e058c5f..b1c4896c90 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8727,14 +8727,12 @@ do_pg_backup_start(const char *backupidstr, bool fast, List **tablespaces,
 				 errmsg("WAL level not sufficient for making an online backup"),
 				 errhint("\"wal_level\" must be set to \"replica\" or \"logical\" at server start.")));
 
-	if (strlen(backupidstr) > MAXPGPATH)
+	if (strlcpy(state->name, backupidstr, sizeof(state->name)) >= sizeof(state->name))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 				 errmsg("backup label too long (max %d bytes)",
 						MAXPGPATH)));
 
-	memcpy(state->name, backupidstr, strlen(backupidstr));
-
 	/*
 	 * Mark backup active in shared memory.  We must do full-page WAL writes
 	 * during an on-line backup even if not doing so at other times, because