diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
index 850921a2..bfb9d319 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
@@ -365,7 +365,7 @@ extension KeyHandler {
     // MARK: Backspace
 
     if input.isBackSpace {
-      return handleBackspace(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
+      return handleBackSpace(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
     // MARK: Delete
diff --git a/Source/Modules/ControllerModules/KeyHandler_States.swift b/Source/Modules/ControllerModules/KeyHandler_States.swift
index 49dacb0e..fa28c65c 100644
--- a/Source/Modules/ControllerModules/KeyHandler_States.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_States.swift
@@ -430,7 +430,7 @@ extension KeyHandler {
   ///   - stateCallback: 狀態回呼。
   ///   - errorCallback: 錯誤回呼。
   /// - Returns: 將按鍵行為「是否有處理掉」藉由 ctlInputMethod 回報給 IMK。
-  func handleBackspace(
+  func handleBackSpace(
     state: InputStateProtocol,
     stateCallback: @escaping (InputStateProtocol) -> Void,
     errorCallback: @escaping () -> Void