diff --git a/constants.h b/constants.h
index cb63d1a..59e3737 100644
--- a/constants.h
+++ b/constants.h
@@ -41,6 +41,8 @@
 extern const char kPrefsLastActivePingDay[];
 extern const char kPrefsLastRollCallPingDay[];
 extern const char kPrefsManifestMetadataSize[];
+extern const char kPrefsMetricsAttemptLastReportingTime[];
+extern const char kPrefsMetricsCheckLastReportingTime[];
 extern const char kPrefsNumReboots[];
 extern const char kPrefsNumResponsesSeen[];
 extern const char kPrefsP2PEnabled[];