diff --git a/src/main/resources/sqlmapper/mappers/fa/equip.xml b/src/main/resources/sqlmapper/mappers/fa/equip.xml
index e6a93ce..5a22852 100644
--- a/src/main/resources/sqlmapper/mappers/fa/equip.xml
+++ b/src/main/resources/sqlmapper/mappers/fa/equip.xml
@@ -352,7 +352,7 @@
       values (
            (CASE
               WHEN (SELECT MAX(NUM) FROM TEQUIPMENT WHERE POLICE = #{police}) IS NULL THEN 1
-              ELSE (SELECT MAX(NUM) + 1 FROM TEQUIPMENT WHERE POLICE = #{police})
+              ELSE (SELECT MAX(NUM)::int + 1 FROM TEQUIPMENT WHERE POLICE = #{police})
            END),
            #{police},
            #{equipType},