diff --git a/legacy/firmware/fsm.c b/legacy/firmware/fsm.c
index 07c4c24b1..b1a0096a0 100644
--- a/legacy/firmware/fsm.c
+++ b/legacy/firmware/fsm.c
@@ -191,6 +191,12 @@ void fsm_sendFailure(FailureType code, const char *text)
       case FailureType_Failure_InvalidSession:
         text = _("Invalid session");
         break;
+      case FailureType_Failure_ThpUnallocatedChannel:
+        text = _("Unallocated channel");
+        break;
+      case FailureType_Failure_ThpUnallocatedSession:
+        text = _("Unallocated session");
+        break;
       case FailureType_Failure_FirmwareError:
         text = _("Firmware error");
         break;