*** a/src/backend/replication/basebackup.c
--- b/src/backend/replication/basebackup.c
***************
*** 847,856 **** 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
--- 847,852 ----
***************
*** 892,897 **** sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
--- 888,905 ----
  		}
  
  		/*
+ 		 * Skip pg_replslot, not useful to copy. But include it as an empty
+ 		 * directory anyway, so we get permissions right.
+ 		 */
+ 		if (strcmp(de->d_name, "pg_replslot") == 0)
+ 		{
+ 			if (!sizeonly)
+ 				_tarWriteHeader(pathbuf + basepathlen + 1, NULL, &statbuf);
+ 			size += 512;		/* Size of the header just added */
+ 			continue;
+ 		}
+ 
+ 		/*
  		 * We can skip pg_xlog, the WAL segments need to be fetched from the
  		 * WAL archive anyway. But include it as an empty directory anyway, so
  		 * we get permissions right.