diff --git a/base/base/getAvailableMemoryAmount.cpp b/base/base/getAvailableMemoryAmount.cpp
index a7b12ef4699..d2f794e8952 100644
--- a/base/base/getAvailableMemoryAmount.cpp
+++ b/base/base/getAvailableMemoryAmount.cpp
@@ -27,7 +27,7 @@ uint64_t getAvailableMemoryAmountOrZero()
     unsigned int usermem;
     size_t len = sizeof(usermem);
     static int mib[2] = { CTL_HW, HW_USERMEM };
-    if (sysctl(mib, 2, &usermem, &len, NULL, 0) == 0 && len == sizeof(usermem))
+    if (sysctl(mib, 2, &usermem, &len, nullptr, 0) == 0 && len == sizeof(usermem))
         return usermem;
     else
         return 0;
diff --git a/src/Common/filesystemHelpers.h b/src/Common/filesystemHelpers.h
index a0c761a516f..27041a2f0a8 100644
--- a/src/Common/filesystemHelpers.h
+++ b/src/Common/filesystemHelpers.h
@@ -35,13 +35,13 @@ enum class BlockDeviceType
 #if !defined(__linux__)
 [[noreturn]]
 #endif
-BlockDeviceType getBlockDeviceType([[maybe_unused]] const String & deviceId);
+BlockDeviceType getBlockDeviceType([[maybe_unused]] const String & device_id);
 
 // Get size of read-ahead in bytes for specified block device
 #if !defined(__linux__)
 [[noreturn]]
 #endif
-UInt64 getBlockDeviceReadAheadBytes([[maybe_unused]] const String & deviceId);
+UInt64 getBlockDeviceReadAheadBytes([[maybe_unused]] const String & device_id);
 
 /// Returns mount point of filesystem where absolute_path (must exist) is located
 std::filesystem::path getMountPoint(std::filesystem::path absolute_path);