diff --git a/src/manta/utils.py b/src/manta/utils.py
index 1d0e3a8..21bcaf7 100644
--- a/src/manta/utils.py
+++ b/src/manta/utils.py
@@ -84,7 +84,6 @@ InternalBusLayout = data.StructLayout(
         "data": 32,
         "rw": 1,
         "valid": 1,
-        "last": 1,
     }
 )