diff --git a/dll/win32/browseui/CAutoComplete.cpp b/dll/win32/browseui/CAutoComplete.cpp
index 6bb970c87f8..434351c9365 100644
--- a/dll/win32/browseui/CAutoComplete.cpp
+++ b/dll/win32/browseui/CAutoComplete.cpp
@@ -21,6 +21,7 @@
  */
 
 #include "precomp.h"
+#include <imm.h> // For IMN_OPENCANDIDATE
 #include <process.h> // _beginthreadex
 
 /*
@@ -344,6 +345,10 @@ LRESULT CAutoComplete::EditWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM l
             if (hwndGotFocus != m_hwndEdit && hwndGotFocus != m_hWnd)
                 HideDropDown();
             break;
+        case WM_IME_NOTIFY:
+            if (wParam == IMN_OPENCANDIDATE)
+                HideDropDown();
+            break;
         case WM_SETTEXT:
             if (!m_bInSetText)
                 HideDropDown(); // it's mechanical WM_SETTEXT