diff --git a/soc/arm/nxp_lpc/lpc55xxx/dts_fixup.h b/soc/arm/nxp_lpc/lpc55xxx/dts_fixup.h
index 1de4e10becb..2f118a5d40d 100644
--- a/soc/arm/nxp_lpc/lpc55xxx/dts_fixup.h
+++ b/soc/arm/nxp_lpc/lpc55xxx/dts_fixup.h
@@ -7,6 +7,7 @@
 /* SoC level DTS fixup file */
 
 #define DT_NUM_IRQ_PRIO_BITS DT_ARM_V8M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS
+#define DT_NUM_MPU_REGIONS   DT_INST_0_ARM_ARMV8M_MPU_ARM_NUM_MPU_REGIONS
 
 #define DT_FLASH_DEV_NAME    DT_INST_0_NXP_LPC_IAP_LABEL