diff --git a/src/main/resources/sql/mapper/utility.xml b/src/main/resources/sql/mapper/utility.xml
index ab14fc8..f2204a5 100644
--- a/src/main/resources/sql/mapper/utility.xml
+++ b/src/main/resources/sql/mapper/utility.xml
@@ -30,7 +30,7 @@ SELECT FOUND_ROWS() TOT_CNT</select>
 
 <sql id="selectToday">SELECT<include refid="utility.today" />TODAY FROM DUAL</sql>
 
-<sql id="thisDay">IFNULL(#{thisDay},<include refid="utility.today" />)</sql>
+<sql id="thisDay">NVL(#{thisDay},<include refid="utility.today" />)</sql>
 
 <sql id="selectThisDay">SELECT<include refid="utility.thisDay" />THIS_DAY</sql>