diff --git a/common/constants.cc b/common/constants.cc
index 310f1b2..5ab96b0 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -124,4 +124,6 @@
 // The default is 1 (always run post install).
 const char kPayloadPropertyRunPostInstall[] = "RUN_POST_INSTALL";
 
+const char kOmahaUpdaterVersion[] = "0.1.0.0";
+
 }  // namespace chromeos_update_engine
diff --git a/common/constants.h b/common/constants.h
index d5a8ae3..9b4623f 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -108,6 +108,8 @@
 extern const char kPayloadPropertySwitchSlotOnReboot[];
 extern const char kPayloadPropertyRunPostInstall[];
 
+extern const char kOmahaUpdaterVersion[];
+
 // A download source is any combination of protocol and server (that's of
 // interest to us when looking at UMA metrics) using which we may download
 // the payload.