diff --git a/sakura_core/dlg/CDialog.cpp b/sakura_core/dlg/CDialog.cpp
index 7ec031ba25..ee7ac7fa69 100644
--- a/sakura_core/dlg/CDialog.cpp
+++ b/sakura_core/dlg/CDialog.cpp
@@ -808,8 +808,8 @@ LRESULT CALLBACK SubEditProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
 
 void CDialog::SetComboBoxDeleter(HWND hwndCtl, CRecent* pRecent)
 {
-	assert(pRecent);
-
+	if (!pRecent || (::GetWindowLongPtr(hwndCtl, GWL_STYLE) & 0b11) == CBS_DROPDOWNLIST)
+		return;
 	COMBOBOXINFO info = { sizeof(COMBOBOXINFO) };
 	if (!::GetComboBoxInfo(hwndCtl, &info))
 		return;
diff --git a/sakura_core/dlg/CDialog.h b/sakura_core/dlg/CDialog.h
index 54df51a35d..a81d8fddbc 100644
--- a/sakura_core/dlg/CDialog.h
+++ b/sakura_core/dlg/CDialog.h
@@ -115,6 +115,11 @@ class CDialog
 
 	void ResizeItem( HWND hTarget, const POINT& ptDlgDefalut, const POINT& ptDlgNew, const RECT& rcItemDefault, EAnchorStyle anchor, bool bUpdate = true);
 	void GetItemClientRect( int wID, RECT& rc );
+
+	//! @brief コンボボックスに履歴削除・単語削除の機能を追加する
+	//!
+	//! @param hwndCtl コンボボックスのハンドル。CBS_DROPDOWNLISTスタイルのコンボボックスには対応していません。
+	//! @param pRecent 紐づけるCRecentへのポインタ。nullptrは指定できません。
 	static void SetComboBoxDeleter( HWND hwndCtl, CRecent* pRecent );
 public:
 
diff --git a/sakura_core/dlg/CDlgOpenFile_CommonFileDialog.cpp b/sakura_core/dlg/CDlgOpenFile_CommonFileDialog.cpp
index 2605579771..285255e562 100644
--- a/sakura_core/dlg/CDlgOpenFile_CommonFileDialog.cpp
+++ b/sakura_core/dlg/CDlgOpenFile_CommonFileDialog.cpp
@@ -370,9 +370,6 @@ UINT_PTR CALLBACK OFNHookProc(
 
 			/* ビューモードの初期値セット */
 			::CheckDlgButton( pData->m_hwndOpenDlg, chx1, pData->m_bViewMode );
-
-			CDialog::SetComboBoxDeleter(pData->m_hwndComboMRU, &pData->m_cRecentFile);
-			CDialog::SetComboBoxDeleter(pData->m_hwndComboOPENFOLDER, &pData->m_cRecentFolder);
 		}
 		break;