diff --git a/constants.cc b/constants.cc
index f9c6ce5..de7bb91 100644
--- a/constants.cc
+++ b/constants.cc
@@ -39,5 +39,7 @@
 const char kPrefsUpdateStateSignedSHA256Context[] =
     "update-state-signed-sha-256-context";
 const char kPrefsWallClockWaitPeriod[] = "wall-clock-wait-period";
+const char kPrefsUpdateTimestampStart[] = "update-timestamp-start";
+const char kPrefsUpdateDurationUptime[] = "update-duration-uptime";
 
 }