diff --git a/ethosu/vela/tflite_mapping.py b/ethosu/vela/tflite_mapping.py
index 4873ecc..06097cd 100644
--- a/ethosu/vela/tflite_mapping.py
+++ b/ethosu/vela/tflite_mapping.py
@@ -54,6 +54,7 @@
 from .tflite import GatherOptions
 from .tflite import GreaterEqualOptions
 from .tflite import GreaterOptions
+from .tflite import HardSwishOptions
 from .tflite import IfOptions
 from .tflite import L2NormOptions
 from .tflite import LeakyReluOptions
@@ -258,6 +259,8 @@
     BuiltinOptions.MatrixSetDiagOptions: MatrixSetDiagOptions.MatrixSetDiagOptions,
     BuiltinOptions.DensifyOptions: DensifyOptions.DensifyOptions,
     BuiltinOptions.DepthToSpaceOptions: DepthToSpaceOptions.DepthToSpaceOptions,
+    BuiltinOptions.HardSwishOptions: HardSwishOptions.HardSwishOptions,
+
     BuiltinOptions.IfOptions: IfOptions.IfOptions,
     BuiltinOptions.NonMaxSuppressionV4Options: NonMaxSuppressionV4Options.NonMaxSuppressionV4Options,
     BuiltinOptions.NonMaxSuppressionV5Options: NonMaxSuppressionV5Options.NonMaxSuppressionV5Options,
@@ -622,6 +625,7 @@
     BuiltinOperator.MATRIX_DIAG: ("MatrixDiag", None),
     BuiltinOperator.QUANTIZE: ("Quantize", None),
     BuiltinOperator.MATRIX_SET_DIAG: ("MatrixSetDiag", None),
+    BuiltinOperator.HARD_SWISH: ("HardSwish", OptionsSerializer("HardSwishOptions")),
     BuiltinOperator.IF: ("If", OptionsSerializer("IfOptions", ("then_subgraph_index", "else_subgraph_index"))),
     BuiltinOperator.WHILE: ("While", OptionsSerializer("WhileOptions", ("cond_subgraph_index", "body_subgraph_index"))),
     BuiltinOperator.NON_MAX_SUPPRESSION_V4: ("NonMaxSuppressionV4", OptionsSerializer("NonMaxSuppressionV4Options")),
diff --git a/ethosu/vela/tflite_reader.py b/ethosu/vela/tflite_reader.py
index 5ab90f0..84c4c3c 100644
--- a/ethosu/vela/tflite_reader.py
+++ b/ethosu/vela/tflite_reader.py
@@ -19,6 +19,7 @@
 
 import numpy as np
 
+from .errors import InputFileError
 from .errors import UnsupportedFeatureError
 from .nn_graph import Graph
 from .nn_graph import Subgraph
@@ -228,6 +229,9 @@
 
     def parse_operator_code(self, code):
         c = code.BuiltinCode()
+        if not c in builtin_operator_map:
+            msg = "The input file contains operator code {} which is currently not supported".format(c)
+            raise InputFileError(self.name, msg)
         op_type, ser = builtin_operator_map[c]
         if c == BuiltinOperator.CUSTOM:
             op_type += decode_str(code.CustomCode())