diff --git a/constants.cc b/constants.cc
index 7878a85..874a004 100644
--- a/constants.cc
+++ b/constants.cc
@@ -43,6 +43,9 @@
 const char kPrefsResumedUpdateFailures[] = "resumed-update-failures";
 const char kPrefsRollbackVersion[] = "rollback-version";
 const char kPrefsSystemUpdatedMarker[] = "system-updated-marker";
+const char kPrefsTargetVersionAttempt[] = "target-version-attempt";
+const char kPrefsTargetVersionInstalledFrom[] = "target-version-installed-from";
+const char kPrefsTargetVersionUniqueId[] = "target-version-unique-id";
 const char kPrefsTotalBytesDownloaded[] = "total-bytes-downloaded";
 const char kPrefsUpdateCheckCount[] = "update-check-count";
 const char kPrefsUpdateCheckResponseHash[] = "update-check-response-hash";