diff --git a/arch/arm/src/armv7-r/mpu.h b/arch/arm/src/armv7-r/mpu.h
index 7a0296cf89a..5c1b6dfb1f3 100644
--- a/arch/arm/src/armv7-r/mpu.h
+++ b/arch/arm/src/armv7-r/mpu.h
@@ -106,6 +106,25 @@
 #  endif
 #endif
 
+/****************************************************************************
+ * Public Type Definitions
+ ****************************************************************************/
+
+struct mpu_region_s
+{
+  /* Region Base Address */
+
+  uintptr_t base;
+
+  /* Region Size */
+
+  size_t size;
+
+  /* Region Attributes */
+
+  uint32_t flags;
+};
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/