diff --git a/core/java/android/app/NotificationChannel.java b/core/java/android/app/NotificationChannel.java
index 47063f0..c06ad3f 100644
--- a/core/java/android/app/NotificationChannel.java
+++ b/core/java/android/app/NotificationChannel.java
@@ -32,6 +32,8 @@
 
 import com.android.internal.util.Preconditions;
 
+import com.android.internal.util.Preconditions;
+
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.xmlpull.v1.XmlPullParser;