diff --git a/Source/Modules/InputHandler_Core.swift b/Source/Modules/InputHandler_Core.swift
index f0b657f1..f519aac8 100644
--- a/Source/Modules/InputHandler_Core.swift
+++ b/Source/Modules/InputHandler_Core.swift
@@ -69,6 +69,7 @@ public protocol InputHandlerDelegate {
   func candidateController() -> CtlCandidateProtocol?
   func candidateSelectionConfirmedByInputHandler(at index: Int)
   func setInlineDisplayWithCursor()
+  func updatePopupDisplayWithCursor()
   func performUserPhraseOperation(addToFilter: Bool)
     -> Bool
 }
@@ -430,6 +431,9 @@ public class InputHandler: InputHandlerProtocol {
     theState.data.cursor = inputting.cursor
     delegate.state = theState // 直接就地取代，不經過 switchState 處理，免得選字窗被重新載入。
     delegate.setInlineDisplayWithCursor()
+    if delegate.clientMitigationLevel >= 2, theState.hasComposition {
+      delegate.updatePopupDisplayWithCursor()
+    }
   }
 
   // MARK: - Extracted methods and functions (Tekkon).