diff --git a/arch/arm/src/nrf91/nrf91_modem_sock.h b/arch/arm/src/nrf91/nrf91_modem_sock.h
deleted file mode 100644
index 8365541dfb7..00000000000
--- a/arch/arm/src/nrf91/nrf91_modem_sock.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/****************************************************************************
- * arch/arm/src/nrf91/nrf91_modem_sock.h
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.  The
- * ASF licenses this file to you 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
- *
- *   http://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.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/