diff --git a/src/main/scala/com/github/shadowsocks/preferences/KcpCliPreference.scala b/src/main/scala/com/github/shadowsocks/preferences/KcpCliPreference.scala
index 79354bb917..d072c61242 100644
--- a/src/main/scala/com/github/shadowsocks/preferences/KcpCliPreference.scala
+++ b/src/main/scala/com/github/shadowsocks/preferences/KcpCliPreference.scala
@@ -26,7 +26,7 @@ class KcpCliPreference(context: Context, attrs: AttributeSet) extends SummaryEdi
           !line.startsWith("   --help,") &&
           !line.startsWith("   --version,"))
         .mkString("\n")
-        .replaceAll("[ ]{2,}", "\n")
+        .replaceAll(" {2,}", "\n")
         .substring(1))  // remove 1st \n
       .show()): DialogInterface.OnClickListener)
   }