diff --git a/src/fsfw/devicehandlers/DeviceCommunicationIF.h b/src/fsfw/devicehandlers/DeviceCommunicationIF.h
index a5546a36..cf827240 100644
--- a/src/fsfw/devicehandlers/DeviceCommunicationIF.h
+++ b/src/fsfw/devicehandlers/DeviceCommunicationIF.h
@@ -49,6 +49,7 @@ class DeviceCommunicationIF {
   // is this needed if there is no open/close call?
   static const ReturnValue_t NOT_ACTIVE = MAKE_RETURN_CODE(0x05);
   static const ReturnValue_t TOO_MUCH_DATA = MAKE_RETURN_CODE(0x06);
+  static constexpr ReturnValue_t BUSY = MAKE_RETURN_CODE(0x07);
 
   virtual ~DeviceCommunicationIF() {}