diff --git a/action_processor.h b/action_processor.h
index 7f7862a..2ed5f78 100644
--- a/action_processor.h
+++ b/action_processor.h
@@ -42,6 +42,7 @@
   kActionCodeNewKernelVerificationError = 16,
   kActionCodeSignedDeltaPayloadExpectedError = 17,
   kActionCodeDownloadPayloadPubKeyVerificationError = 18,
+  kActionCodePostinstallBootedFromFirmwareB = 19,
   kActionCodeOmahaRequestEmptyResponseError = 200,
   kActionCodeOmahaRequestXMLParseError = 201,
   kActionCodeOmahaRequestNoUpdateCheckNode = 202,