diff --git a/ecs/jskult-batch/src/batch/mst_inst_all.py b/ecs/jskult-batch/src/batch/mst_inst_all.py
index 706ef7dc..96a9e7d2 100644
--- a/ecs/jskult-batch/src/batch/mst_inst_all.py
+++ b/ecs/jskult-batch/src/batch/mst_inst_all.py
@@ -344,11 +344,11 @@ class MstInstAll(JskultBatchEntrypoint):
                     mim.upd_date
                 FROM
                     src07.mst_inst_merck AS mim
-                JOIN (
-					SELECT mim.inst_cd, MAX(mim.eff_end_ym) AS max_end_ym
-					FROM src07.mst_inst_merck AS mim
-					GROUP BY mim.inst_cd
-					) AS mim_max_end_ym
+                INNER JOIN (
+                    SELECT mim.inst_cd, MAX(mim.eff_end_ym) AS max_end_ym
+                    FROM src07.mst_inst_merck AS mim
+                    GROUP BY mim.inst_cd
+                    ) AS mim_max_end_ym
 				ON mim.inst_cd = mim_max_end_ym.inst_cd 
                 AND mim.eff_end_ym = mim_max_end_ym.max_end_ym
                 LEFT OUTER JOIN src07.mst_jis_pref AS mjp