diff --git a/Source/WindowControllers/ctlPrefWindow.swift b/Source/WindowControllers/ctlPrefWindow.swift
index 521b5c1d..705a9c9a 100644
--- a/Source/WindowControllers/ctlPrefWindow.swift
+++ b/Source/WindowControllers/ctlPrefWindow.swift
@@ -168,6 +168,12 @@ extension RangeReplaceableCollection where Element: Hashable {
 
     }
 
+    // 這裡有必要加上這段處理，用來確保藉由偏好設定介面動過的 CNS 開關能夠立刻生效。
+    // 所有涉及到語言模型開關的內容均需要這樣處理。
+    @IBAction func toggleCNSSupport(_ sender: Any) {
+        mgrLangModel.setCNSEnabled(Preferences.cns11643Enabled)
+    }
+
     @IBAction func toggleTrad2KangXiAction(_ sender: Any) {
         if chkTrad2KangXi.state == .on && chkTrad2JISShinjitai.state == .on {
             Preferences.toggleShiftJISShinjitaiOutputEnabled()
diff --git a/Source/WindowNIBs/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib b/Source/WindowNIBs/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
index 5c1c8960..62a39d34 100644
--- a/Source/WindowNIBs/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
+++ b/Source/WindowNIBs/Source/WindowNIBs/Base.lproj/frmPrefWindow.xib
@@ -232,7 +232,7 @@
                                                 <rect key="frame" x="3" y="3" width="445" height="134"/>
                                                 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                                 <subviews>
-                                                    <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="Yaj-QY-7xV">
+                                                    <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="Yaj-QY-7xV" userLabel="chkCNSSupport">
                                                         <rect key="frame" x="19" y="104.5" width="406" height="17"/>
                                                         <constraints>
                                                             <constraint firstAttribute="height" constant="16" id="KdE-Vd-Y50"/>
@@ -242,6 +242,7 @@
                                                             <font key="font" metaFont="cellTitle"/>
                                                         </buttonCell>
                                                         <connections>
+                                                            <action selector="toggleCNSSupport:" target="-2" id="mcY-ma-N0c"/>
                                                             <binding destination="32" name="value" keyPath="values.CNS11643Enabled" id="Pbx-Gt-upm"/>
                                                         </connections>
                                                     </button>