diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
new file mode 100644
index af3c95a..470e6d1
*** a/src/backend/replication/walsender.c
--- b/src/backend/replication/walsender.c
*************** WalSndGetStateString(WalSndState state)
*** 1350,1362 ****
  	switch (state)
  	{
  		case WALSNDSTATE_STARTUP:
! 			return "STARTUP";
  		case WALSNDSTATE_BACKUP:
! 			return "BACKUP";
  		case WALSNDSTATE_CATCHUP:
! 			return "CATCHUP";
  		case WALSNDSTATE_STREAMING:
! 			return "STREAMING";
  	}
  	return "UNKNOWN";
  }
--- 1350,1362 ----
  	switch (state)
  	{
  		case WALSNDSTATE_STARTUP:
! 			return "startup";
  		case WALSNDSTATE_BACKUP:
! 			return "backup";
  		case WALSNDSTATE_CATCHUP:
! 			return "catchup";
  		case WALSNDSTATE_STREAMING:
! 			return "streaming";
  	}
  	return "UNKNOWN";
  }
*************** pg_stat_get_wal_senders(PG_FUNCTION_ARGS
*** 1501,1511 ****
  			 * informational, not different from priority.
  			 */
  			if (sync_priority[i] == 0)
! 				values[7] = CStringGetTextDatum("ASYNC");
  			else if (i == sync_standby)
! 				values[7] = CStringGetTextDatum("SYNC");
  			else
! 				values[7] = CStringGetTextDatum("POTENTIAL");
  		}
  
  		tuplestore_putvalues(tupstore, tupdesc, values, nulls);
--- 1501,1511 ----
  			 * informational, not different from priority.
  			 */
  			if (sync_priority[i] == 0)
! 				values[7] = CStringGetTextDatum("async");
  			else if (i == sync_standby)
! 				values[7] = CStringGetTextDatum("sync");
  			else
! 				values[7] = CStringGetTextDatum("potential");
  		}
  
  		tuplestore_putvalues(tupstore, tupdesc, values, nulls);