diff --git a/migrations/versions/d0eeb8049623_add_comments.py b/migrations/versions/d0eeb8049623_add_comments.py
index 4b8599a..f6fab5b 100644
--- a/migrations/versions/d0eeb8049623_add_comments.py
+++ b/migrations/versions/d0eeb8049623_add_comments.py
@@ -23,7 +23,7 @@ def upgrade():
     sa.Column('torrent_id', sa.Integer(), nullable=False),
     sa.Column('user_id', sa.Integer(), nullable=True),
     sa.Column('created_time', sa.DateTime(), nullable=True),
-    sa.Column('text', sa.String(length=255), nullable=False),
+    sa.Column('text', sa.String(length=255, collation='utf8mb4_bin'), nullable=False),
     sa.ForeignKeyConstraint(['torrent_id'], ['nyaa_torrents.id'], ondelete='CASCADE'),
     sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
     sa.PrimaryKeyConstraint('id')
@@ -33,7 +33,7 @@ def upgrade():
     sa.Column('torrent_id', sa.Integer(), nullable=False),
     sa.Column('user_id', sa.Integer(), nullable=True),
     sa.Column('created_time', sa.DateTime(), nullable=True),
-    sa.Column('text', sa.String(length=255), nullable=False),
+    sa.Column('text', sa.String(length=255, collation='utf8mb4_bin'), nullable=False),
     sa.ForeignKeyConstraint(['torrent_id'], ['sukebei_torrents.id'], ondelete='CASCADE'),
     sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
     sa.PrimaryKeyConstraint('id')
diff --git a/nyaa/models.py b/nyaa/models.py
index e623aa8..aed2f6a 100644
--- a/nyaa/models.py
+++ b/nyaa/models.py
@@ -329,7 +329,7 @@ class Comment(db.Model):
         DB_TABLE_PREFIX + 'torrents.id', ondelete='CASCADE'), nullable=False)
     user_id = db.Column(db.Integer, db.ForeignKey('users.id', ondelete='CASCADE'))
     created_time = db.Column(db.DateTime(timezone=False), default=datetime.utcnow)
-    text = db.Column(db.String(length=255), nullable=False)
+    text = db.Column(db.String(length=255, collation=COL_UTF8MB4_BIN), nullable=False)
 
     user = db.relationship('User', uselist=False, back_populates='comments', lazy="joined")