diff --git a/src/controller.cpp b/src/controller.cpp
index c27f12e..8dc6311 100644
--- a/src/controller.cpp
+++ b/src/controller.cpp
@@ -197,8 +197,8 @@ void SesameController::prepareResponseBuffer(MessageResult result, Message* mess
             outgoingMessage.message.messageType = MessageType::response;
         }
     } else {
-        outgoingMessage.message.clientChallenge = message->clientChallenge;
-        outgoingMessage.message.serverChallenge = message->serverChallenge;
+        outgoingMessage.message.clientChallenge = 0;
+        outgoingMessage.message.serverChallenge = 0;
         outgoingMessage.message.messageType = MessageType::response;
     }