*** a/src/backend/replication/basebackup.c
--- b/src/backend/replication/basebackup.c
***************
*** 862,871 **** sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
  		if (strcmp(de->d_name, BACKUP_LABEL_FILE) == 0)
  			continue;
  
- 		/* Skip pg_replslot, not useful to copy */
- 		if (strcmp(de->d_name, "pg_replslot") == 0)
- 			continue;
- 
  		/*
  		 * Check if the postmaster has signaled us to exit, and abort with an
  		 * error in that case. The error handler further up will call
--- 862,867 ----
***************
*** 907,912 **** sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
--- 903,920 ----
  		}
  
  		/*
+ 		 * We can skip replication slot files. But include it as an empty
+ 		 * direcotry anyway.
+ 		 */
+ 		if (strcmp(pathbuf, "./pg_replslot") == 0)
+ 		{
+ 			if (!sizeonly)
+ 				_tarWriteHeader(pathbuf + basepathlen + 1, NULL, &statbuf);
+ 			size += 512;
+ 			continue;
+ 		}
+ 
+ 		/*
  		 * Skip temporary statistics files. PG_STAT_TMP_DIR must be skipped
  		 * even when stats_temp_directory is set because PGSS_TEXT_FILE is
  		 * always created there.