diff --git a/prefs.cc b/prefs.cc
index 400056e..03a122a 100644
--- a/prefs.cc
+++ b/prefs.cc
@@ -37,8 +37,10 @@
 const char kPrefsWallClockWaitPeriod[] = "wall-clock-wait-period";
 const char kPrefsUpdateFirstSeenAt[] = "update-first-seen-at";
 
+const char kPrefsPayloadAttemptNumber[] = "payload-attempt-number";
 const char kPrefsCurrentResponse[] = "current-omaha-response";
 const char kPrefsCurrentUrlIndex[] = "current-url-index";
+const char kPrefsCurrentUrlFailureCount[] = "current-url-failure-count";
 
 bool Prefs::Init(const FilePath& prefs_dir) {
   prefs_dir_ = prefs_dir;