diff --git a/action_processor.h b/action_processor.h
index ef06181..7f7862a 100644
--- a/action_processor.h
+++ b/action_processor.h
@@ -41,6 +41,7 @@
   kActionCodeNewRootfsVerificationError = 15,
   kActionCodeNewKernelVerificationError = 16,
   kActionCodeSignedDeltaPayloadExpectedError = 17,
+  kActionCodeDownloadPayloadPubKeyVerificationError = 18,
   kActionCodeOmahaRequestEmptyResponseError = 200,
   kActionCodeOmahaRequestXMLParseError = 201,
   kActionCodeOmahaRequestNoUpdateCheckNode = 202,