diff --git a/common/constants.cc b/common/constants.cc
index 26adbe0..4bca105 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -93,6 +93,7 @@
 const char kPrefsUpdateBootTimestampStart[] = "update-boot-timestamp-start";
 const char kPrefsUpdateTimestampStart[] = "update-timestamp-start";
 const char kPrefsUrlSwitchCount[] = "url-switch-count";
+const char kPrefsVerityWritten[] = "verity-written";
 const char kPrefsWallClockScatteringWaitPeriod[] = "wall-clock-wait-period";
 const char kPrefsWallClockStagingWaitPeriod[] =
     "wall-clock-staging-wait-period";
diff --git a/common/constants.h b/common/constants.h
index 897d2e2..1057a65 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -91,6 +91,7 @@
 extern const char kPrefsUpdateBootTimestampStart[];
 extern const char kPrefsUpdateTimestampStart[];
 extern const char kPrefsUrlSwitchCount[];
+extern const char kPrefsVerityWritten[];
 extern const char kPrefsWallClockScatteringWaitPeriod[];
 extern const char kPrefsWallClockStagingWaitPeriod[];