diff --git a/src/main/scala/com/github/shadowsocks/Shadowsocks.scala b/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
index 5843ea67..5c6a6e0d 100644
--- a/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
+++ b/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
@@ -467,18 +467,22 @@ class Shadowsocks
           fab.setBackgroundTintList(greyTint)
           fabProgressCircle.show()
           changeSwitch(checked = true)
+          setPreferenceEnabled(false)
         case State.CONNECTED =>
           fab.setBackgroundTintList(greenTint)
           fabProgressCircle.hide()
           changeSwitch(checked = true)
+          setPreferenceEnabled(false)
         case State.STOPPING =>
           fab.setBackgroundTintList(greyTint)
           fabProgressCircle.show()
           changeSwitch(checked = false)
+          setPreferenceEnabled(false)
         case _ =>
           fab.setBackgroundTintList(greyTint)
           fabProgressCircle.hide()
           changeSwitch(checked = false)
+          setPreferenceEnabled(true)
       }
       state = bgService.getState
     }