diff --git a/action_processor.h b/action_processor.h
index 7d2e9f8..38d63ae 100644
--- a/action_processor.h
+++ b/action_processor.h
@@ -65,6 +65,7 @@
   kActionCodeDownloadMetadataSignatureMissingError = 39,
   kActionCodeOmahaUpdateDeferredForBackoff = 40,
   kActionCodePostinstallPowerwashError = 41,
+  kActionCodeUpdateCanceledByChannelChange = 42,
 
   // Note: When adding new error codes, please remember to add the
   // error into one of the buckets in PayloadState::UpdateFailed method so