diff --git a/Arrowgene.Ddon.Database/Files/Database/Script/equip_migration_sqlite.sql b/Arrowgene.Ddon.Database/Files/Database/Script/equip_migration_sqlite.sql
index d1731a82e..35d2bf3e7 100644
--- a/Arrowgene.Ddon.Database/Files/Database/Script/equip_migration_sqlite.sql
+++ b/Arrowgene.Ddon.Database/Files/Database/Script/equip_migration_sqlite.sql
@@ -6,11 +6,11 @@ CREATE TABLE "ddon_system_mail_attachment" (
     "attachment_id"	INTEGER NOT NULL,
 	"message_id"	INTEGER NOT NULL,
 	"attachment_type"	INTEGER NOT NULL,
-	"is_received"	INTEGER NOT NULL DEFAULT 0,
+	"is_received"	BOOLEAN NOT NULL DEFAULT FALSE,
 	"param0"	VARCHAR(256) NOT NULL DEFAULT "",
 	"param1"	INTEGER NOT NULL DEFAULT 0,
 	"param2"	INTEGER NOT NULL DEFAULT 0,
 	"param3"	INTEGER NOT NULL DEFAULT 0,
     PRIMARY KEY("attachment_id" AUTOINCREMENT),
 	FOREIGN KEY("message_id") REFERENCES "ddon_system_mail"("message_id") ON DELETE CASCADE
-);
\ No newline at end of file
+);
diff --git a/Arrowgene.Ddon.Database/Files/Database/Script/migration_mail_sqlite.sql b/Arrowgene.Ddon.Database/Files/Database/Script/migration_mail_sqlite.sql
index 54bd51836..52da82d1e 100644
--- a/Arrowgene.Ddon.Database/Files/Database/Script/migration_mail_sqlite.sql
+++ b/Arrowgene.Ddon.Database/Files/Database/Script/migration_mail_sqlite.sql
@@ -14,10 +14,10 @@ CREATE TABLE "ddon_system_mail_attachment" (
 	"message_id"	INTEGER NOT NULL,
 	"attachment_id"	INTEGER NOT NULL,
 	"attachment_type"	INTEGER NOT NULL,
-	"is_received"	INTEGER NOT NULL DEFAULT 0,
+	"is_received"	BOOLEAN NOT NULL DEFAULT FALSE,
 	"param0"	VARCHAR(256) NOT NULL DEFAULT "",
 	"param1"	INTEGER NOT NULL DEFAULT 0,
 	"param2"	INTEGER NOT NULL DEFAULT 0,
 	"param3"	INTEGER NOT NULL DEFAULT 0,
 	FOREIGN KEY("message_id") REFERENCES "ddon_system_mail"("message_id") ON DELETE CASCADE
-);
\ No newline at end of file
+);
diff --git a/Arrowgene.Ddon.Database/Files/Database/Script/schema_sqlite.sql b/Arrowgene.Ddon.Database/Files/Database/Script/schema_sqlite.sql
index 565206abc..d4d4b79be 100644
--- a/Arrowgene.Ddon.Database/Files/Database/Script/schema_sqlite.sql
+++ b/Arrowgene.Ddon.Database/Files/Database/Script/schema_sqlite.sql
@@ -588,7 +588,7 @@ CREATE TABLE IF NOT EXISTS "ddon_system_mail_attachment"
     "attachment_id"   INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
     "message_id"      INTEGER                           NOT NULL,
     "attachment_type" INTEGER                           NOT NULL,
-    "is_received"     INTEGER                           NOT NULL DEFAULT 0,
+    "is_received"     BOOLEAN                           NOT NULL DEFAULT FALSE,
     "param0"          VARCHAR(256)                      NOT NULL DEFAULT '',
     "param1"          INTEGER                           NOT NULL DEFAULT 0,
     "param2"          INTEGER                           NOT NULL DEFAULT 0,