diff --git a/contrib/pg_xlogdump/pg_xlogdump.c b/contrib/pg_xlogdump/pg_xlogdump.c
index 0a176bb..7686a4f 100644
--- a/contrib/pg_xlogdump/pg_xlogdump.c
+++ b/contrib/pg_xlogdump/pg_xlogdump.c
@@ -515,7 +515,7 @@ XLogDumpDisplayStats(XLogDumpConfig *config, XLogDumpStats *stats)
 
 				id = desc->rm_identify(rj << 4);
 				if (id == NULL)
-					id = psprintf("0x%x", rj << 4);
+					id = psprintf("UNKNOWN (%x)", rj << 4);
 
 				XLogDumpStatsRow(psprintf("%s/%s", desc->rm_name, id),
 								 count, 100 * (double)count / total_count,