diff --git a/conf.go b/conf.go
index 5986d67..2c96823 100644
--- a/conf.go
+++ b/conf.go
@@ -32,9 +32,11 @@ func GetConfig() *Config {
 }
 
 func SetConfig(url string, database string) *Config {
-	instance = &Config{
-		MongoUrl:      url,
-		MongoDatabase: database,
-	}
+	once.Do(func() {
+		instance = &Config{
+			MongoUrl:      url,
+			MongoDatabase: database,
+		}
+	})
 	return instance
 }