diff --git a/src/modules/protocol.cpp b/src/modules/protocol.cpp
index 0661e9b..5a100ea 100644
--- a/src/modules/protocol.cpp
+++ b/src/modules/protocol.cpp
@@ -100,7 +100,7 @@ DecodeStatus Protocol::DecodeResponse(uint8_t c) {
         case 'E':
         case 'W':
         case 'K':
-        case 'F':
+        case 'f':
             responseMsg.request.code = (RequestMsgCodes)c;
             responseMsg.request.value = 0;
             rspState = ResponseStates::RequestValue;
diff --git a/src/modules/protocol.h b/src/modules/protocol.h
index b4c0670..8bcc3b7 100644
--- a/src/modules/protocol.h
+++ b/src/modules/protocol.h
@@ -24,7 +24,8 @@ enum class RequestMsgCodes : uint8_t {
     Eject = 'E',
     Wait = 'W',
     Cut = 'K',
-    FilamentSensor = 'F'
+    FilamentType = 'F',
+    FilamentSensor = 'f'
 };
 
 /// Definition of response message parameter codes