diff --git a/src/backend/access/transam/twophase.c b/src/backend/access/transam/twophase.c
index 608c5149e5..874c8ed125 100644
--- a/src/backend/access/transam/twophase.c
+++ b/src/backend/access/transam/twophase.c
@@ -1074,6 +1074,9 @@ StartPrepare(GlobalTransaction gxact)
 	hdr.ninvalmsgs = xactGetCommittedInvalidationMessages(&invalmsgs,
 														  &hdr.initfileinval);
 	hdr.gidlen = strlen(gxact->gid) + 1;	/* Include '\0' */
+	/* EndPrepare will fill the origin data, if necessary */
+	hdr.origin_lsn = InvalidXLogRecPtr;
+	hdr.origin_timestamp = 0;
 
 	save_state_data(&hdr, sizeof(TwoPhaseFileHeader));
 	save_state_data(gxact->gid, hdr.gidlen);
@@ -1133,11 +1136,6 @@ EndPrepare(GlobalTransaction gxact)
 		hdr->origin_lsn = replorigin_session_origin_lsn;
 		hdr->origin_timestamp = replorigin_session_origin_timestamp;
 	}
-	else
-	{
-		hdr->origin_lsn = InvalidXLogRecPtr;
-		hdr->origin_timestamp = 0;
-	}
 
 	/*
 	 * If the data size exceeds MaxAllocSize, we won't be able to read it in