diff --git a/extensions/external-download-manager.vala b/extensions/external-download-manager.vala
index b4e783ab..b9e9606d 100644
--- a/extensions/external-download-manager.vala
+++ b/extensions/external-download-manager.vala
@@ -37,6 +37,7 @@ namespace EDM {
         public bool download_requested (Midori.View view, WebKit.Download download) {
             if (download.get_data<void*> ("save-as-download") == null
              && download.get_data<void*> ("open-download") == null
+             && download.get_data<void*> ("open-in-viewer") == null
              && download.get_data<void*> ("cancel-download") == null) {
                 var dlReq = new DownloadRequest ();
                 dlReq.uri = download.get_uri ();