diff --git a/ethosu/mlw_codec/mlw_common.h b/ethosu/mlw_codec/mlw_common.h
new file mode 100644
index 0000000..008473a
--- /dev/null
+++ b/ethosu/mlw_codec/mlw_common.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2020 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+#ifndef __MLW_COMMON_H__
+#define __MLW_COMMON_H__
+
+#define ZDIV_DISABLE        6   // not alternating mode
+#define ZDIV_EOS            7   // indicates end of stream
+
+#define WDIV_UNCOMPRESSED   7   // indicates uncompressed weights
+
+#endif