diff --git a/ethosu/vela/tflite_graph_optimiser.py b/ethosu/vela/tflite_graph_optimiser.py
index 68b4e8e..2959803 100644
--- a/ethosu/vela/tflite_graph_optimiser.py
+++ b/ethosu/vela/tflite_graph_optimiser.py
@@ -1515,13 +1515,7 @@
             bias_shape = [shape[-1]]
             op.set_input_tensor(
                 create_const_tensor(
-                    "bias",
-                    bias_shape,
-                    inp.dtype,
-                    np.ones(bias_shape) * bias,
-                    value_dtype=np.int32,
-                    quant_value_dtype=np.int32,
-                    quantization=None,
+                    "bias", bias_shape, inp.dtype, np.ones(bias_shape) * bias, value_dtype=np.int32, quantization=None,
                 ),
                 2,
             )
diff --git a/ethosu/vela/tflite_supported_operators.py b/ethosu/vela/tflite_supported_operators.py
index cb3d504..dc4e6f0 100644
--- a/ethosu/vela/tflite_supported_operators.py
+++ b/ethosu/vela/tflite_supported_operators.py
@@ -386,7 +386,7 @@
         "Optional Bias tensor values must fit within 40-bits"
         bias = op.bias
         if bias and bias.dtype == DataType.int64 and bias.values is not None:
-            valid = all(len(bin(quant_value)[2:]) <= 40 for quant_value in bias.values)
+            valid = all(len(bin(value)[2:]) <= 40 for value in bias.values)
             return valid, f"Tensor '{bias.name}' has values larger than 40-bits"
         return True, "Op has no bias tensor, or it fits in 40-bit"