diff --git a/common/constants.cc b/common/constants.cc
index 87bdf91..6f37e16 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -56,6 +56,7 @@
 const char kPrefsOmahaCohortHint[] = "omaha-cohort-hint";
 const char kPrefsOmahaCohortName[] = "omaha-cohort-name";
 const char kPrefsOmahaEolStatus[] = "omaha-eol-status";
+const char kPrefsOmahaMilestonesToEol[] = "omaha-milestones-to-eol";
 const char kPrefsP2PEnabled[] = "p2p-enabled";
 const char kPrefsP2PFirstAttemptTimestamp[] = "p2p-first-attempt-timestamp";
 const char kPrefsP2PNumAttempts[] = "p2p-num-attempts";
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[];