diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 7b1b3e802b..5cda30836f 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -12109,6 +12109,9 @@ read_backup_label(XLogRecPtr *checkPointLoc, TimeLineID *backupLabelTLI,
 	uint32		hi,
 				lo;
 
+	/* suppress possible uninitialized-variable warnings */
+	*checkPointLoc = InvalidXLogRecPtr;
+	*backupLabelTLI = 0;
 	*backupEndRequired = false;
 	*backupFromStandby = false;