diff --git a/sources/MacOSKeyCodes.swift b/sources/MacOSKeyCodes.swift
index f4316e35b..0613fc648 100644
--- a/sources/MacOSKeyCodes.swift
+++ b/sources/MacOSKeyCodes.swift
@@ -10,21 +10,21 @@ import AppKit
 
 struct SquirrelKeycode {
   
-  static func osxModifiersToRime(modifiers: UInt) -> UInt32 {
+  static func osxModifiersToRime(modifiers: NSEvent.ModifierFlags) -> UInt32 {
     var ret: UInt32 = 0
-    if modifiers & NSEvent.ModifierFlags.capsLock.rawValue != 0 {
+    if modifiers.contains(.capsLock) {
       ret |= kLockMask.rawValue
     }
-    if modifiers & NSEvent.ModifierFlags.shift.rawValue != 0 {
+    if modifiers.contains(.shift) {
       ret |= kShiftMask.rawValue
     }
-    if modifiers & NSEvent.ModifierFlags.control.rawValue != 0 {
+    if modifiers.contains(.control) {
       ret |= kControlMask.rawValue
     }
-    if modifiers & NSEvent.ModifierFlags.option.rawValue != 0 {
+    if modifiers.contains(.option) {
       ret |= kAltMask.rawValue
     }
-    if modifiers & NSEvent.ModifierFlags.command.rawValue != 0 {
+    if modifiers.contains(.command) {
       ret |= kSuperMask.rawValue
     }
     return ret
diff --git a/sources/SquirrelInputController.swift b/sources/SquirrelInputController.swift
index e0eae3648..4a72bc387 100644
--- a/sources/SquirrelInputController.swift
+++ b/sources/SquirrelInputController.swift
@@ -58,7 +58,7 @@ final class SquirrelInputController: IMKInputController {
         break
       }
       // print("[DEBUG] FLAGSCHANGED client: \(sender ?? "nil"), modifiers: \(modifiers)")
-      var rimeModifiers: UInt32 = SquirrelKeycode.osxModifiersToRime(modifiers: modifiers.rawValue)
+      var rimeModifiers: UInt32 = SquirrelKeycode.osxModifiersToRime(modifiers: modifiers)
       // For flags-changed event, keyCode is available since macOS 10.15
       // (#715)
       let rimeKeycode: UInt32 = SquirrelKeycode.osxKeycodeToRime(keycode: event.keyCode, keychar: nil, shift: false, caps: false)
@@ -99,7 +99,7 @@ final class SquirrelInputController: IMKInputController {
                                                            shift: modifiers.contains(.shift),
                                                            caps: modifiers.contains(.capsLock))
         if rimeKeycode != 0 {
-          let rimeModifiers = SquirrelKeycode.osxModifiersToRime(modifiers: modifiers.rawValue)
+          let rimeModifiers = SquirrelKeycode.osxModifiersToRime(modifiers: modifiers)
           handled = processKey(rimeKeycode, modifiers: rimeModifiers)
           rimeUpdate()
         }