diff --git a/app/src/main/java/fr/free/nrw/commons/media/MediaDetailPagerFragment.java b/app/src/main/java/fr/free/nrw/commons/media/MediaDetailPagerFragment.java
index 7359f82fd..260338680 100644
--- a/app/src/main/java/fr/free/nrw/commons/media/MediaDetailPagerFragment.java
+++ b/app/src/main/java/fr/free/nrw/commons/media/MediaDetailPagerFragment.java
@@ -1,16 +1,22 @@
 package fr.free.nrw.commons.media;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
 import android.app.DownloadManager;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.database.DataSetObserver;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
+import android.support.design.widget.Snackbar;
+import android.support.v4.app.ActivityCompat;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.content.ContextCompat;
 import android.support.v4.view.MenuItemCompat;
 import android.support.v4.view.ViewPager;
 import android.support.v7.widget.ShareActionProvider;
@@ -182,9 +188,20 @@ public class MediaDetailPagerFragment extends Fragment implements ViewPager.OnPa
         req.allowScanningByMediaScanner();
         req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 
-        // TODO: Check we have android.permission.WRITE_EXTERNAL_STORAGE
-        final DownloadManager manager = (DownloadManager)getActivity().getSystemService(Context.DOWNLOAD_SERVICE);
-        final long downloadId = manager.enqueue(req);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !(ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)) {
+            Snackbar.make(getView(), R.string.storage_permission_rationale,
+                    Snackbar.LENGTH_INDEFINITE)
+                    .setAction(R.string.ok, new View.OnClickListener() {
+                        @Override
+                        public void onClick(View view) {
+                            ActivityCompat.requestPermissions(getActivity(),
+                                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
+                        }
+                    }).show();
+        } else {
+            final DownloadManager manager = (DownloadManager)getActivity().getSystemService(Context.DOWNLOAD_SERVICE);
+            manager.enqueue(req);
+        }
     }
 
     @Override