diff --git a/delta_performer.cc b/delta_performer.cc
index de877b8..6094c5a 100644
--- a/delta_performer.cc
+++ b/delta_performer.cc
@@ -68,6 +68,8 @@
 const unsigned DeltaPerformer::kProgressDownloadWeight = 50;
 const unsigned DeltaPerformer::kProgressOperationsWeight = 50;
 
+const uint64_t kChromeOSMajorPayloadVersion = 1;
+const uint64_t kBrilloMajorPayloadVersion = 2;
 const uint32_t kInPlaceMinorPayloadVersion = 1;
 const uint32_t kSourceMinorPayloadVersion = 2;