diff --git a/prefs.cc b/prefs.cc
index abce538..400056e 100644
--- a/prefs.cc
+++ b/prefs.cc
@@ -37,6 +37,9 @@
 const char kPrefsWallClockWaitPeriod[] = "wall-clock-wait-period";
 const char kPrefsUpdateFirstSeenAt[] = "update-first-seen-at";
 
+const char kPrefsCurrentResponse[] = "current-omaha-response";
+const char kPrefsCurrentUrlIndex[] = "current-url-index";
+
 bool Prefs::Init(const FilePath& prefs_dir) {
   prefs_dir_ = prefs_dir;
   return true;