diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index b134cf69..7263039f 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -30,7 +30,8 @@
                 android:resource="@xml/widget_info"/>
         </receiver>
 
-        <activity android:name=".MyWidgetConfigure">
+        <activity
+            android:name=".MyWidgetConfigure">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
             </intent-filter>
diff --git a/app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MyWidgetConfigure.java b/app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MyWidgetConfigure.java
index 39de45be..1dcb0214 100644
--- a/app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MyWidgetConfigure.java
+++ b/app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MyWidgetConfigure.java
@@ -1,14 +1,14 @@
 package calculator.simplemobiletools.com.simple_calculator;
 
-import android.app.Activity;
 import android.appwidget.AppWidgetManager;
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
 
 import butterknife.ButterKnife;
 import butterknife.OnClick;
 
-public class MyWidgetConfigure extends Activity {
+public class MyWidgetConfigure extends AppCompatActivity {
     private int widgetId;
 
     @Override