diff --git a/trunk/pedo_alg_thre_det2.c b/trunk/pedo_alg_thre_det2.c
index b5d731d..c071dd1 100644
--- a/trunk/pedo_alg_thre_det2.c
+++ b/trunk/pedo_alg_thre_det2.c
@@ -500,8 +500,10 @@ static unsigned long my_sqrt(unsigned long x)
 ======================================================== */
 static u16 calc_hours_spend( u8 year )
 {
-    // 同じ年の内
-    if( bcdtob( cal_log_latest.year_bcd ) == year )
+	u8 temp_arg_year_bcd = bcdtob( year );
+
+		// 同じ年の内
+    if( cal_log_latest.year_bcd == temp_arg_year_bcd )
     {
         if( now_longhour > last_hour_fny )
         {
@@ -512,12 +514,12 @@ static u16 calc_hours_spend( u8 year )
 			return( 0 );  // 同じ時間帯(と、巻き戻り。　どうなっても知らない)
 		}
     }
-    else if( cal_log_latest.year_bcd == ( year -1 ) )
+    else if( cal_log_latest.year_bcd == ( temp_arg_year_bcd -1 ) )
     {
         // 年をまたいでいるとき
         return( ( ( 365 + ( is_firstyear(year) ? 1: 0 )) * 24 ) - last_hour_fny + now_longhour );
     }
-    else if( cal_log_latest.year_bcd < year )
+    else if( cal_log_latest.year_bcd < temp_arg_year_bcd )
     {
         // 数年放置
         return( PEDOMETER_LOG_SIZE +1 );