diff --git a/app/src/main/java/com/topjohnwu/magisk/MagiskManager.java b/app/src/main/java/com/topjohnwu/magisk/MagiskManager.java
index 545413e37..017a05098 100644
--- a/app/src/main/java/com/topjohnwu/magisk/MagiskManager.java
+++ b/app/src/main/java/com/topjohnwu/magisk/MagiskManager.java
@@ -31,11 +31,8 @@ import com.topjohnwu.magisk.utils.Shell;
 import com.topjohnwu.magisk.utils.Topic;
 import com.topjohnwu.magisk.utils.Utils;
 
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.OutputStream;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -229,23 +226,14 @@ public class MagiskManager extends Application {
                 }
             }
 
-            File utils = new File(getFilesDir(), Utils.UTIL_FUNCTIONS);
-
-            try (InputStream in  = getAssets().open(Utils.UTIL_FUNCTIONS);
-                 OutputStream out = new FileOutputStream(utils)
-            ) {
-                int read;
-                byte[] bytes = new byte[4096];
-                while ((read = in.read(bytes)) != -1) {
-                    out.write(bytes, 0, read);
-                }
+            try (InputStream in  = getAssets().open(Utils.UTIL_FUNCTIONS)) {
+                shell.loadInputStream(in);
             } catch (IOException e) {
                 e.printStackTrace();
             }
 
             shell.su_raw(
                     "export PATH=" + BUSYBOXPATH + ":$PATH",
-                    ". " + utils,
                     "mount_partitions",
                     "BOOTIMAGE=",
                     "find_boot_image",
diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java b/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
index 822b6cbdd..e8afee71e 100644
--- a/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
+++ b/app/src/main/java/com/topjohnwu/magisk/utils/Shell.java
@@ -9,6 +9,7 @@ import java.io.BufferedReader;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -132,6 +133,19 @@ public class Shell {
         return rootStatus > 0;
     }
 
+    public void loadInputStream(InputStream in) {
+        try {
+            int read;
+            byte[] bytes = new byte[4096];
+            while ((read = in.read(bytes)) != -1) {
+                STDIN.write(bytes, 0, read);
+            }
+            STDIN.flush();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
     public List<String> sh(String... commands) {
         List<String> res = new ArrayList<>();
         if (!isValid) return res;