diff --git a/ultrasonic/src/main/java/org/moire/ultrasonic/util/FileUtil.java b/ultrasonic/src/main/java/org/moire/ultrasonic/util/FileUtil.java
index e4b7e2cc..056f0df2 100644
--- a/ultrasonic/src/main/java/org/moire/ultrasonic/util/FileUtil.java
+++ b/ultrasonic/src/main/java/org/moire/ultrasonic/util/FileUtil.java
@@ -23,7 +23,6 @@ import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Build;
 import android.os.Environment;
-import android.os.StatFs;
 import android.text.TextUtils;
 
 import org.moire.ultrasonic.app.UApp;
@@ -43,6 +42,9 @@ import java.util.SortedSet;
 import java.util.TreeSet;
 import java.util.regex.Pattern;
 
+import kotlin.Lazy;
+import timber.log.Timber;
+
 import static org.koin.java.KoinJavaComponent.inject;
 
 /**