diff --git a/arch/arm/src/cxd56xx/cxd56_cpuindex.c b/arch/arm/src/cxd56xx/cxd56_cpuindex.c
index f850af0e8e..1d9fa85323 100644
--- a/arch/arm/src/cxd56xx/cxd56_cpuindex.c
+++ b/arch/arm/src/cxd56xx/cxd56_cpuindex.c
@@ -42,15 +42,10 @@
 #include <nuttx/arch.h>
 
 #include "arm_arch.h"
+#include "cxd56_cpuindex.h"
 
 #ifdef CONFIG_SMP
 
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-#define CXD56_ADSP_PID 0x0e002040  /* APP_DSP Processor ID */
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
diff --git a/arch/arm/src/cxd56xx/cxd56_cpuindex.h b/arch/arm/src/cxd56xx/cxd56_cpuindex.h
new file mode 100644
index 0000000000..651759c396
--- /dev/null
+++ b/arch/arm/src/cxd56xx/cxd56_cpuindex.h
@@ -0,0 +1,30 @@
+/****************************************************************************
+ * arch/arm/src/cxd56xx/cxd56_cpuindex.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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_CXD56XX_CXD56_CPUINDEX_H
+#define __ARCH_ARM_SRC_CXD56XX_CXD56_CPUINDEX_H
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define CXD56_ADSP_PID 0x0e002040  /* APP_DSP Processor ID */
+
+#endif /* __ARCH_ARM_SRC_CXD56XX_CXD56_CPUINDEX_H */