diff --git a/common/constants.cc b/common/constants.cc
index 215ca31..2edfbb7 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -92,7 +92,9 @@
     "update-state-signed-sha-256-context";
 const char kPrefsUpdateTimestampStart[] = "update-timestamp-start";
 const char kPrefsUrlSwitchCount[] = "url-switch-count";
-const char kPrefsWallClockWaitPeriod[] = "wall-clock-wait-period";
+const char kPrefsWallClockScatteringWaitPeriod[] = "wall-clock-wait-period";
+const char kPrefsWallClockStagingWaitPeriod[] =
+    "wall-clock-staging-wait-period";
 
 // These four fields are generated by scripts/brillo_update_payload.
 const char kPayloadPropertyFileSize[] = "FILE_SIZE";
diff --git a/common/constants.h b/common/constants.h
index 78353d8..d97c5fb 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -90,7 +90,8 @@
 extern const char kPrefsUpdateStateSignedSHA256Context[];
 extern const char kPrefsUpdateTimestampStart[];
 extern const char kPrefsUrlSwitchCount[];
-extern const char kPrefsWallClockWaitPeriod[];
+extern const char kPrefsWallClockScatteringWaitPeriod[];
+extern const char kPrefsWallClockStagingWaitPeriod[];
 
 // Keys used when storing and loading payload properties.
 extern const char kPayloadPropertyFileSize[];