diff --git a/payload_constants.cc b/payload_constants.cc
index 9d6fb3d..aeddf11 100644
--- a/payload_constants.cc
+++ b/payload_constants.cc
@@ -18,6 +18,13 @@
 
 namespace chromeos_update_engine {
 
+const uint64_t kChromeOSMajorPayloadVersion = 1;
+const uint64_t kBrilloMajorPayloadVersion = 2;
+
+const uint32_t kFullPayloadMinorVersion = 0;
+const uint32_t kInPlaceMinorPayloadVersion = 1;
+const uint32_t kSourceMinorPayloadVersion = 2;
+
 const char kLegacyPartitionNameKernel[] = "boot";
 const char kLegacyPartitionNameRoot[] = "system";