diff --git a/src/db/manual.rs b/src/db/manual.rs
index b31c953..292e02c 100644
--- a/src/db/manual.rs
+++ b/src/db/manual.rs
@@ -41,7 +41,7 @@ pub(crate) async fn insert_manual(pool: &sqlx::PgPool, m: ManualMember) -> Resul
     sqlx::query!(
         "insert into manual values ($1,$2,$3,$4,$5)",
         m.discord_id,
-        m.shortcode,
+        m.shortcode.to_lowercase(),
         m.nickname,
         m.realname,
         m.fresher
diff --git a/src/db/members.rs b/src/db/members.rs
index 2afd826..b9d39c1 100644
--- a/src/db/members.rs
+++ b/src/db/members.rs
@@ -115,7 +115,7 @@ pub(crate) async fn insert_member(pool: &sqlx::PgPool, m: Member) -> Result<(),
     sqlx::query!(
         "insert into members values ($1, $2, $3, $4, $5)",
         m.discord_id,
-        m.shortcode,
+        m.shortcode.to_lowercase(),
         m.nickname,
         m.realname,
         m.fresher
diff --git a/src/db/pending.rs b/src/db/pending.rs
index 6696580..8397aad 100644
--- a/src/db/pending.rs
+++ b/src/db/pending.rs
@@ -43,7 +43,7 @@ pub(crate) async fn insert_pending(pool: &sqlx::PgPool, p: PendingMember) -> Res
     sqlx::query!(
         "insert into pending values ($1, $2, $3)",
         p.discord_id,
-        p.shortcode,
+        p.shortcode.to_lowercase(),
         p.realname
     )
     .execute(pool)