diff --git a/mobile/src/main/scala/com/github/shadowsocks/GlobalConfigFragment.scala b/mobile/src/main/scala/com/github/shadowsocks/GlobalConfigFragment.scala
index 137e18d13f..1811b72768 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/GlobalConfigFragment.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/GlobalConfigFragment.scala
@@ -32,10 +32,7 @@ import com.takisoft.fix.support.v7.preference.PreferenceFragmentCompatDividers
 class GlobalConfigFragment extends PreferenceFragmentCompatDividers {
   override def onCreatePreferencesFix(bundle: Bundle, key: String) {
     getPreferenceManager.setPreferenceDataStore(app.dataStore)
-    app.dataStore.putString(Key.serviceMode, app.dataStore.serviceMode) // temporary workaround for support lib bug
-    app.dataStore.putString(Key.portProxy, app.dataStore.portProxy.toString)
-    app.dataStore.putString(Key.portLocalDns, app.dataStore.portLocalDns.toString)
-    app.dataStore.putString(Key.portTransproxy, app.dataStore.portTransproxy.toString)
+    app.dataStore.initGlobal()
     addPreferencesFromResource(R.xml.pref_global)
     val switch = findPreference(Key.isAutoConnect).asInstanceOf[SwitchPreference]
     switch.setOnPreferenceChangeListener((_, value) => {
diff --git a/mobile/src/main/scala/com/github/shadowsocks/preference/OrmLitePreferenceDataStore.scala b/mobile/src/main/scala/com/github/shadowsocks/preference/OrmLitePreferenceDataStore.scala
index 034bbfb870..cc3e2387be 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/preference/OrmLitePreferenceDataStore.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/preference/OrmLitePreferenceDataStore.scala
@@ -125,4 +125,12 @@ final class OrmLitePreferenceDataStore(dbHelper: DBHelper) extends PreferenceDat
   def plugin_=(value: String): Unit = putString(Key.plugin, value)
   def dirty: Boolean = getBoolean(Key.dirty)
   def dirty_=(value: Boolean): Unit = putBoolean(Key.dirty, value)
+
+  def initGlobal() {
+    // temporary workaround for support lib bug
+    if (getString(Key.serviceMode) == null) putString(Key.serviceMode, serviceMode)
+    if (getString(Key.portProxy) == null) putString(Key.portProxy, portProxy.toString)
+    if (getString(Key.portLocalDns) == null) putString(Key.portLocalDns, portLocalDns.toString)
+    if (getString(Key.portTransproxy) == null) putString(Key.portTransproxy, portTransproxy.toString)
+  }
 }