diff --git a/common/constants.cc b/common/constants.cc
index d3d851a..215ca31 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -61,6 +61,7 @@
 const char kPrefsPostInstallSucceeded[] = "post-install-succeeded";
 const char kPrefsPreviousVersion[] = "previous-version";
 const char kPrefsResumedUpdateFailures[] = "resumed-update-failures";
+const char kPrefsRollbackHappened[] = "rollback-happened";
 const char kPrefsRollbackVersion[] = "rollback-version";
 const char kPrefsChannelOnSlotPrefix[] = "channel-on-slot-";
 const char kPrefsSystemUpdatedMarker[] = "system-updated-marker";
diff --git a/common/constants.h b/common/constants.h
index ddf7df5..a3d01c9 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -63,6 +63,7 @@
 extern const char kPrefsPostInstallSucceeded[];
 extern const char kPrefsPreviousVersion[];
 extern const char kPrefsResumedUpdateFailures[];
+extern const char kPrefsRollbackHappened[];
 extern const char kPrefsRollbackVersion[];
 extern const char kPrefsChannelOnSlotPrefix[];
 extern const char kPrefsSystemUpdatedMarker[];