diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index fa60c92e13a..cb4a8586873 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -457,7 +457,7 @@ IdentifySystem(void)
 	values[0] = CStringGetTextDatum(sysid);
 
 	/* column 2: timeline */
-	values[1] = Int32GetDatum(currTLI);
+	values[1] = Int64GetDatum(currTLI);
 
 	/* column 3: wal location */
 	values[2] = CStringGetTextDatum(xloc);