diff --git a/ShadowsocksX-NG/PACUtils.swift b/ShadowsocksX-NG/PACUtils.swift
index d07d21e..800de97 100644
--- a/ShadowsocksX-NG/PACUtils.swift
+++ b/ShadowsocksX-NG/PACUtils.swift
@@ -96,7 +96,7 @@ func GeneratePACFile() -> Bool {
                 let userRuleStr = try String(contentsOfFile: PACUserRuleFilePath, encoding: String.Encoding.utf8)
                 let userRuleLines = userRuleStr.components(separatedBy: CharacterSet.newlines)
                 
-                lines += userRuleLines
+                lines = userRuleLines + lines
             } catch {
                 NSLog("Not found user-rule.txt")
             }