diff --git a/libcpu/arm/cortex-m33/mpu.c b/libcpu/arm/cortex-m33/mpu.c
index bddd60022cf..e82084fa533 100644
--- a/libcpu/arm/cortex-m33/mpu.c
+++ b/libcpu/arm/cortex-m33/mpu.c
@@ -108,12 +108,12 @@ rt_bool_t rt_hw_mpu_region_valid(rt_mem_region_t *region)
         LOG_E("Region size is too small");
         return RT_FALSE;
     }
-    if (region->size & (~(MPU_MIN_REGION_SIZE - 1U)) != region->size)
+    if ((region->size & (~(MPU_MIN_REGION_SIZE - 1U))) != region->size)
     {
         LOG_E("Region size is not a multiple of 32 bytes");
         return RT_FALSE;
     }
-    if ((rt_uint32_t)region->start & (MPU_MIN_REGION_SIZE - 1U) != 0U)
+    if (((rt_uint32_t)region->start & (MPU_MIN_REGION_SIZE - 1U)) != 0U)
     {
         LOG_E("Region is not aligned by 32 bytes");
         return RT_FALSE;
diff --git a/libcpu/arm/cortex-m7/mpu.c b/libcpu/arm/cortex-m7/mpu.c
index 63fde3d3524..e6b417da773 100644
--- a/libcpu/arm/cortex-m7/mpu.c
+++ b/libcpu/arm/cortex-m7/mpu.c
@@ -71,12 +71,12 @@ rt_bool_t rt_hw_mpu_region_valid(rt_mem_region_t *region)
         LOG_E("Region size is too small");
         return RT_FALSE;
     }
-    if (region->size & (region->size - 1U) != 0U)
+    if ((region->size & (region->size - 1U)) != 0U)
     {
         LOG_E("Region size is not power of 2");
         return RT_FALSE;
     }
-    if ((rt_uint32_t)region->start & (region->size - 1U) != 0U)
+    if (((rt_uint32_t)region->start & (region->size - 1U)) != 0U)
     {
         LOG_E("Region is not naturally aligned");
         return RT_FALSE;