diff --git a/sam/db/schema/mysql/20180704080000.base.up.sql b/sam/db/schema/mysql/20180704080000.base.up.sql
index 70220e43f..68c4e3199 100644
--- a/sam/db/schema/mysql/20180704080000.base.up.sql
+++ b/sam/db/schema/mysql/20180704080000.base.up.sql
@@ -82,7 +82,7 @@ CREATE TABLE channel_members (
   type             ENUM ('owner', 'member') NOT NULL DEFAULT 'member',
 
   created_at       DATETIME        NOT NULL DEFAULT NOW(),
-  updated_at       DATETIME            NULL
+  updated_at       DATETIME            NULL,
 
   PRIMARY KEY (rel_channel, rel_user)
 );