diff --git a/src/main/resources/mapper/MemberMapper.xml b/src/main/resources/mapper/MemberMapper.xml
index b40214f..7f77847 100644
--- a/src/main/resources/mapper/MemberMapper.xml
+++ b/src/main/resources/mapper/MemberMapper.xml
@@ -316,7 +316,7 @@
         FROM
             member m
             LEFT JOIN class_member_mapping cm ON cm.member_id = m.id
-            LEFT JOIN ( SELECT member_id, count( 1 ) AS ts FROM exercise_done_result WHERE score >= 60 GROUP BY class_id ) AS r ON r.member_id = m.id
+            LEFT JOIN ( SELECT member_id, count( 1 ) AS ts, class_id FROM exercise_done_result WHERE score >= 60 GROUP BY class_id ) AS r ON r.member_id = m.id AND r.class_id = cm.class_id
         WHERE
             cm.class_id = #{classId}
             AND r.ts is NULL