diff --git a/boot/zephyr/arm_cleanup.c b/boot/zephyr/arm_cleanup.c
index c52c578..ff4b42e 100644
--- a/boot/zephyr/arm_cleanup.c
+++ b/boot/zephyr/arm_cleanup.c
@@ -21,6 +21,7 @@
 	}
 }
 
+#if CONFIG_CPU_HAS_ARM_MPU
 __weak void z_arm_clear_arm_mpu_config(void)
 {
 	int i;
@@ -32,3 +33,4 @@
 		ARM_MPU_ClrRegion(i);
 	}
 }
+#endif