diff --git a/sakura_core/view/CEditView.cpp b/sakura_core/view/CEditView.cpp
index 3e125534cb..58a4287978 100644
--- a/sakura_core/view/CEditView.cpp
+++ b/sakura_core/view/CEditView.cpp
@@ -385,9 +385,18 @@ BOOL CEditView::Create(
 
 	/* キーボードの現在のリピート間隔を取得 */
 	DWORD dwKeyBoardSpeed;
-	SystemParametersInfo( SPI_GETKEYBOARDSPEED, 0, &dwKeyBoardSpeed, 0 );
+	constexpr DWORD keyboardRepeatSpeedMax = 31; // 0～31の範囲の最大値
+	if( SystemParametersInfo( SPI_GETKEYBOARDSPEED, 0, &dwKeyBoardSpeed, 0 ) ){
+		// 念の為に assert で確認
+		assert(dwKeyBoardSpeed <= keyboardRepeatSpeedMax);
+	}
+	else{
+		// SystemParametersInfo の呼び出しが失敗した場合は最大値をデフォルト値として設定
+		constexpr DWORD keyboardRepeatSpeedDefault = keyboardRepeatSpeedMax;
+		dwKeyBoardSpeed = keyboardRepeatSpeedDefault;
+	}
 	/* リピート速度の設定をミリ秒に変換 */
-	UINT uElapse = 400 - dwKeyBoardSpeed * (400 - 33) / 31;
+	UINT uElapse = 400 - dwKeyBoardSpeed * (400 - 33) / keyboardRepeatSpeedMax;
 	/* タイマー起動 */
 	if( 0 == ::SetTimer( GetHwnd(), IDT_ROLLMOUSE, uElapse, EditViewTimerProc ) ){
 		WarningMessage( GetHwnd(), LS(STR_VIEW_TIMER) );