diff --git a/prefs_interface.h b/prefs_interface.h
index cc7c4d1..7bc56ca 100644
--- a/prefs_interface.h
+++ b/prefs_interface.h
@@ -27,8 +27,10 @@
 extern const char kPrefsUpdateCheckCount[];
 extern const char kPrefsWallClockWaitPeriod[];
 extern const char kPrefsUpdateFirstSeenAt[];
+extern const char kPrefsPayloadAttemptNumber[];
 extern const char kPrefsCurrentResponse[];
 extern const char kPrefsCurrentUrlIndex[];
+extern const char kPrefsCurrentUrlFailureCount[];
 
 // The prefs interface allows access to a persistent preferences
 // store. The two reasons for providing this as an interface are