diff --git a/common/database.go b/common/database.go
index c8f59a8d..ce7a9bc1 100644
--- a/common/database.go
+++ b/common/database.go
@@ -2,5 +2,6 @@ package common
 
 var UsingSQLite = false
 var UsingPostgreSQL = false
+var UsingMySQL = false
 
 var SQLitePath = "one-api.db?_busy_timeout=5000"
diff --git a/model/main.go b/model/main.go
index bb91255e..62a02a21 100644
--- a/model/main.go
+++ b/model/main.go
@@ -62,6 +62,7 @@ func chooseDB() (*gorm.DB, error) {
 				dsn += "?parseTime=true"
 			}
 		}
+		common.UsingMySQL = true
 		return gorm.Open(mysql.Open(dsn), &gorm.Config{
 			PrepareStmt: true, // precompile SQL
 		})
@@ -92,6 +93,9 @@ func InitDB() (err error) {
 		if !common.IsMasterNode {
 			return nil
 		}
+		if common.UsingMySQL {
+			_, _ = sqlDB.Exec("DROP INDEX idx_channels_key ON channels;") // TODO: delete this line when most users have upgraded
+		}
 		common.SysLog("database migration started")
 		err = db.AutoMigrate(&Channel{})
 		if err != nil {