diff --git a/migrations/v5.go b/migrations/v5.go
index 88ddd28..adc48da 100644
--- a/migrations/v5.go
+++ b/migrations/v5.go
@@ -1,78 +1,78 @@
 package migrations
 
 import (
 	"context"
 	"database/sql"
 
 	wf_db "github.com/writeas/writefreely/db"
 )
 
 func oauthSlack(db *datastore) error {
 	dialect := wf_db.DialectMySQL
 	if db.driverName == driverSQLite {
 		dialect = wf_db.DialectSQLite
 	}
 	return wf_db.RunTransactionWithOptions(context.Background(), db.DB, &sql.TxOptions{}, func(ctx context.Context, tx *sql.Tx) error {
 		builders := []wf_db.SQLBuilder{
 			dialect.
 				AlterTable("oauth_client_states").
 				AddColumn(dialect.
 					Column(
 						"provider",
 						wf_db.ColumnTypeVarChar,
 						wf_db.OptionalInt{Set: true, Value: 24}).SetDefault("")),
 			dialect.
 				AlterTable("oauth_client_states").
 				AddColumn(dialect.
 					Column(
 						"client_id",
 						wf_db.ColumnTypeVarChar,
 						wf_db.OptionalInt{Set: true, Value: 128}).SetDefault("")),
 			dialect.
 				AlterTable("oauth_users").
 				AddColumn(dialect.
 					Column(
 						"provider",
 						wf_db.ColumnTypeVarChar,
 						wf_db.OptionalInt{Set: true, Value: 24}).SetDefault("")),
 			dialect.
 				AlterTable("oauth_users").
 				AddColumn(dialect.
 					Column(
 						"client_id",
 						wf_db.ColumnTypeVarChar,
 						wf_db.OptionalInt{Set: true, Value: 128}).SetDefault("")),
 			dialect.
 				AlterTable("oauth_users").
 				AddColumn(dialect.
 					Column(
 						"access_token",
 						wf_db.ColumnTypeVarChar,
 						wf_db.OptionalInt{Set: true, Value: 512}).SetDefault("")),
-			dialect.CreateUniqueIndex("oauth_users", "oauth_users", "user_id", "provider", "client_id"),
+			dialect.CreateUniqueIndex("oauth_users_uk", "oauth_users", "user_id", "provider", "client_id"),
 		}
 
 		if dialect != wf_db.DialectSQLite {
 			// This updates the length of the `remote_user_id` column. It isn't needed for SQLite databases.
 			builders = append(builders, dialect.
 				AlterTable("oauth_users").
 				ChangeColumn("remote_user_id",
 					dialect.
 						Column(
 							"remote_user_id",
 							wf_db.ColumnTypeVarChar,
 							wf_db.OptionalInt{Set: true, Value: 128})))
 		}
 
 		for _, builder := range builders {
 			query, err := builder.ToSQL()
 			if err != nil {
 				return err
 			}
 			if _, err := tx.ExecContext(ctx, query); err != nil {
 				return err
 			}
 		}
 		return nil
 	})
 }