diff --git a/payload_constants.cc b/payload_constants.cc
index 05f114d..9d6fb3d 100644
--- a/payload_constants.cc
+++ b/payload_constants.cc
@@ -18,6 +18,9 @@
 
 namespace chromeos_update_engine {
 
+const char kLegacyPartitionNameKernel[] = "boot";
+const char kLegacyPartitionNameRoot[] = "system";
+
 const char kDeltaMagic[] = "CrAU";
 const char kBspatchPath[] = "bspatch";