diff --git a/ShadowsocksX-NG/LaunchAgentUtils.swift b/ShadowsocksX-NG/LaunchAgentUtils.swift
index 5cbfff5..7314e71 100644
--- a/ShadowsocksX-NG/LaunchAgentUtils.swift
+++ b/ShadowsocksX-NG/LaunchAgentUtils.swift
@@ -103,7 +103,8 @@ func InstallSSLocal() {
     let fileMgr = FileManager.default
     let homeDir = NSHomeDirectory()
     let appSupportDir = homeDir+APP_SUPPORT_DIR
-    if !fileMgr.fileExists(atPath: appSupportDir + "ss-local-\(SS_LOCAL_VERSION)/ss-local") {
+    if !fileMgr.fileExists(atPath: appSupportDir + "ss-local-\(SS_LOCAL_VERSION)/ss-local")
+       || !fileMgr.fileExists(atPath: appSupportDir + "ss-local-\(SS_LOCAL_VERSION)/libmbedcrypto.0.dylib") {
         let bundle = Bundle.main
         let installerPath = bundle.path(forResource: "install_ss_local.sh", ofType: nil)
         let task = Process.launchedProcess(launchPath: installerPath!, arguments: [""])
diff --git a/ShadowsocksX-NG/install_ss_local.sh b/ShadowsocksX-NG/install_ss_local.sh
index 78eec6a..e37edc3 100755
--- a/ShadowsocksX-NG/install_ss_local.sh
+++ b/ShadowsocksX-NG/install_ss_local.sh
@@ -22,6 +22,7 @@ ln -s "$TargetDir" "$LatestTargetDir"
 
 cp -f libev.4.dylib "$TargetDir"
 cp -f libmbedcrypto.2.4.2.dylib "$TargetDir"
+ln -s  "$TargetDir/libmbedcrypto.2.4.2.dylib" "$TargetDir/libmbedcrypto.0.dylib"
 cp -f libpcre.1.dylib "$TargetDir"
 cp -f libsodium.18.dylib "$TargetDir"
 cp -f libudns.0.dylib "$TargetDir"