diff --git a/common/constants.h b/common/constants.h
index eb489fc..7170201 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -104,6 +104,7 @@
 extern const char kPrefsVerityWritten[];
 extern const char kPrefsWallClockScatteringWaitPeriod[];
 extern const char kPrefsWallClockStagingWaitPeriod[];
+extern const char kPrefsManifestBytes[];
 
 // Keys used when storing and loading payload properties.
 extern const char kPayloadPropertyFileSize[];