diff --git a/common/constants.h b/common/constants.h
index d95a56a..6034dbd 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -57,6 +57,7 @@
 extern const char kPrefsOmahaCohortHint[];
 extern const char kPrefsOmahaCohortName[];
 extern const char kPrefsOmahaEolStatus[];
+extern const char kPrefsOmahaMilestonesToEol[];
 extern const char kPrefsP2PEnabled[];
 extern const char kPrefsP2PFirstAttemptTimestamp[];
 extern const char kPrefsP2PNumAttempts[];