diff --git a/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java b/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
index bf95c24..b4ec3fe 100644
--- a/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
+++ b/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
@@ -119,8 +119,8 @@ public class EasterDream extends DreamService {
         enabled = true;
 
         WallpaperManager wallPaperManager = WallpaperManager.getInstance(this);
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && wallPaperManager.isWallpaperSupported()) {
-            if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || wallPaperManager.isWallpaperSupported()) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                 wallPaperDrawable = wallPaperManager.getDrawable();
             }
         }