diff --git a/os/common/ports/ARMCMx/devices/NRF51822/cmparams.h b/os/common/ports/ARMCMx/devices/NRF51822/cmparams.h
index 645a4382..0cb4ee48 100644
--- a/os/common/ports/ARMCMx/devices/NRF51822/cmparams.h
+++ b/os/common/ports/ARMCMx/devices/NRF51822/cmparams.h
@@ -37,14 +37,14 @@
 #define CORTEX_MODEL            0
 
 /**
- * @brief   Systick unit presence.
+ * @brief   Memory Protection unit presence.
  */
-#define CORTEX_HAS_ST           FALSE
+#define CORTEX_HAS_MPU          1
 
 /**
  * @brief   Floating Point unit presence.
  */
-#define CORTEX_HAS_FPU          FALSE
+#define CORTEX_HAS_FPU          0
 
 /**
  * @brief   Number of bits in priority masks.