diff --git a/Source/Modules/ControllerModules/InputSignal.swift b/Source/Modules/ControllerModules/InputSignal.swift
index f20951ec..d53866bd 100644
--- a/Source/Modules/ControllerModules/InputSignal.swift
+++ b/Source/Modules/ControllerModules/InputSignal.swift
@@ -296,7 +296,7 @@ struct InputSignal: CustomStringConvertible {
     KeyCode(rawValue: keyCode) == KeyCode.kBackSpace
   }
 
-  var isESC: Bool {
+  var isEsc: Bool {
     KeyCode(rawValue: keyCode) == KeyCode.kEscape
   }
 
diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift b/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
index c42ec121..0e78df2a 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleCandidate.swift
@@ -55,7 +55,7 @@ extension KeyHandler {
     // MARK: 取消選字 (Cancel Candidate)
 
     let cancelCandidateKey =
-      input.isBackSpace || input.isESC || input.isDelete
+      input.isBackSpace || input.isEsc || input.isDelete
       || ((input.isCursorBackward || input.isCursorForward) && input.isShiftHold)
 
     if cancelCandidateKey {
diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
index bfb9d319..857fe3b8 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
@@ -303,7 +303,7 @@ extension KeyHandler {
 
     // MARK: Esc
 
-    if input.isESC { return handleEsc(state: state, stateCallback: stateCallback, errorCallback: errorCallback) }
+    if input.isEsc { return handleEsc(state: state, stateCallback: stateCallback, errorCallback: errorCallback) }
 
     // MARK: Tab
 
diff --git a/Source/Modules/ControllerModules/KeyHandler_States.swift b/Source/Modules/ControllerModules/KeyHandler_States.swift
index fc900bcb..5fe6f2bf 100644
--- a/Source/Modules/ControllerModules/KeyHandler_States.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_States.swift
@@ -212,7 +212,7 @@ extension KeyHandler {
     stateCallback: @escaping (InputStateProtocol) -> Void,
     errorCallback: @escaping () -> Void
   ) -> Bool {
-    if input.isESC {
+    if input.isEsc {
       stateCallback(buildInputtingState)
       return true
     }