diff --git a/docbow_project/docbow/views.py b/docbow_project/docbow/views.py
index 549f368..22aaacd 100644
--- a/docbow_project/docbow/views.py
+++ b/docbow_project/docbow/views.py
@@ -449,7 +449,7 @@ def help(request, pagename='index.html'):
         filepath = os.path.join(settings.HELP_DIR, pagename)
         if not os.path.abspath(filepath).startswith(settings.HELP_DIR):
             return HttpResponseForbidden()
-        response = HttpResponse(content=open(filepath))
+        response = HttpResponse(content=open(filepath, 'rb'))
         response['Content-Type'] = 'image/png'
         return response