diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/Async.java b/app/src/main/java/com/topjohnwu/magisk/utils/Async.java
index f408e3dff..5989c324e 100644
--- a/app/src/main/java/com/topjohnwu/magisk/utils/Async.java
+++ b/app/src/main/java/com/topjohnwu/magisk/utils/Async.java
@@ -218,8 +218,9 @@ public class Async {
 
         protected boolean unzipAndCheck() {
             ZipUtils.unzip(mCachedFile, mCachedFile.getParentFile(), "META-INF/com/google/android");
-            String line = Utils.readFirstLine(mCachedFile.getParent() + "/META-INF/com/google/android/updater-script");
-            return line != null && line.contains("#MAGISK");
+            List<String> ret;
+            ret = Utils.readFile(mCachedFile.getParent() + "/META-INF/com/google/android/updater-script");
+            return Utils.isValidShellResponse(ret) && ret.get(0).contains("#MAGISK");
         }
 
         @Override
diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/Utils.java b/app/src/main/java/com/topjohnwu/magisk/utils/Utils.java
index 08aeddd1a..36a90e652 100644
--- a/app/src/main/java/com/topjohnwu/magisk/utils/Utils.java
+++ b/app/src/main/java/com/topjohnwu/magisk/utils/Utils.java
@@ -75,17 +75,6 @@ public class Utils {
         return ret;
     }
 
-    public static String readFirstLine(String path) {
-        List<String> ret;
-        String command = "head -1 " + path;
-        if (Shell.rootAccess()) {
-            ret = Shell.su(command);
-        } else {
-            ret = Shell.sh(command);
-        }
-        return isValidShellResponse(ret) ? ret.get(0) : null;
-    }
-
     public static void dlAndReceive(Context context, DownloadReceiver receiver, String link, String filename) {
         if (isDownloading) {
             return;