diff --git a/Source/Modules/IMEModules/mgrPrefs.swift b/Source/Modules/IMEModules/mgrPrefs.swift
index 5f02603d..955c4eea 100644
--- a/Source/Modules/IMEModules/mgrPrefs.swift
+++ b/Source/Modules/IMEModules/mgrPrefs.swift
@@ -683,7 +683,7 @@ public enum mgrPrefs {
 extension mgrPrefs {
   static func fixOddPreferences() {
     // 防呆。macOS 10.11 用 IMK 選字窗會崩潰。
-    if #unavailable(macOS 10.13) { mgrPrefs.useIMKCandidateWindow = false }
+    if #unavailable(macOS 10.14) { mgrPrefs.useIMKCandidateWindow = false }
     if #unavailable(macOS 10.15) {
       handleDefaultCandidateFontsByLangIdentifier = false
       shouldAlwaysUseShiftKeyAccommodation = false
diff --git a/Source/WindowControllers/ctlPrefWindow.swift b/Source/WindowControllers/ctlPrefWindow.swift
index be3000e3..b3fc27f3 100644
--- a/Source/WindowControllers/ctlPrefWindow.swift
+++ b/Source/WindowControllers/ctlPrefWindow.swift
@@ -336,7 +336,7 @@ extension ctlPrefWindow: NSToolbarDelegate {
   }
 
   var toolbarIdentifiers: [NSToolbarItem.Identifier] {
-    if #available(macOS 10.13, *) {
+    if #available(macOS 10.14, *) {
       return [.ofGeneral, .ofExperience, .ofDictionary, .ofKeyboard, .ofDevZone]
     }
     return [.ofGeneral, .ofExperience, .ofDictionary, .ofKeyboard]