diff --git a/src/main/scala/tk/mygod/preference/NumberPickerPreference.scala b/src/main/scala/tk/mygod/preference/NumberPickerPreference.scala
index 05294277..4267e962 100644
--- a/src/main/scala/tk/mygod/preference/NumberPickerPreference.scala
+++ b/src/main/scala/tk/mygod/preference/NumberPickerPreference.scala
@@ -4,12 +4,37 @@ import android.content.Context
 import android.content.res.TypedArray
 import android.support.v7.preference.DialogPreference
 import android.util.AttributeSet
+import android.view.View
+import android.view.ViewGroup.LayoutParams
 import android.widget.NumberPicker
+import android.widget.EditText
 import com.github.shadowsocks.R
 
+class MyNumberPicker(private val context: Context, attrs: AttributeSet = null)
+  extends NumberPicker(context, attrs) {
+  override def addView(child: View) {
+    super.addView(child)
+    updateView(child)
+  }
+  override def addView(child: View, params: LayoutParams) {
+    super.addView(child, params)
+    updateView(child)
+  }
+  override def addView(child: View, index: Int, params: LayoutParams) {
+    super.addView(child, index, params)
+    updateView(child)
+  }
+  def updateView(child: View) {
+    if (child.isInstanceOf[EditText]) {
+      child.asInstanceOf[EditText].setTextSize(dp2px(6))
+    }
+  }
+  def dp2px(dp: Float): Int = (dp*getResources().getDisplayMetrics().density).toInt
+}
+
 class NumberPickerPreference(private val context: Context, attrs: AttributeSet = null)
   extends DialogPreference(context, attrs) with SummaryPreference {
-  private[preference] val picker = new NumberPicker(context)
+  private[preference] val picker = new MyNumberPicker(context)
   private var value: Int = _
 
   {