diff --git a/dlls/winebus.sys/bus_iohid.c b/dlls/winebus.sys/bus_iohid.c
index 501a40d26ed..ac706f5265c 100644
--- a/dlls/winebus.sys/bus_iohid.c
+++ b/dlls/winebus.sys/bus_iohid.c
@@ -295,7 +295,7 @@ static void handle_DeviceMatchingCallback(void *context, IOReturn result, void *
     pid = CFNumberToDWORD(IOHIDDeviceGetProperty(IOHIDDevice, CFSTR(kIOHIDProductIDKey)));
     version = CFNumberToDWORD(IOHIDDeviceGetProperty(IOHIDDevice, CFSTR(kIOHIDVersionNumberKey)));
     str = IOHIDDeviceGetProperty(IOHIDDevice, CFSTR(kIOHIDSerialNumberKey));
-    if (str) CFStringToWSTR(str, serial_string, sizeof(serial_string) / sizeof(WCHAR));
+    if (str) CFStringToWSTR(str, serial_string, ARRAY_SIZE(serial_string));
 
     if (IOHIDDeviceConformsTo(IOHIDDevice, kHIDPage_GenericDesktop, kHIDUsage_GD_GamePad) ||
        IOHIDDeviceConformsTo(IOHIDDevice, kHIDPage_GenericDesktop, kHIDUsage_GD_Joystick))
diff --git a/dlls/winebus.sys/main.c b/dlls/winebus.sys/main.c
index 2f3c05aa96a..deb2c86d96d 100644
--- a/dlls/winebus.sys/main.c
+++ b/dlls/winebus.sys/main.c
@@ -696,7 +696,7 @@ BOOL is_xbox_gamepad(WORD vid, WORD pid)
     if (vid != VID_MICROSOFT)
         return FALSE;
 
-    for (i = 0; i < sizeof(PID_XBOX_CONTROLLERS)/sizeof(*PID_XBOX_CONTROLLERS); i++)
+    for (i = 0; i < ARRAY_SIZE(PID_XBOX_CONTROLLERS); i++)
         if (pid == PID_XBOX_CONTROLLERS[i]) return TRUE;
 
     return FALSE;