diff --git a/judge/views/problem.py b/judge/views/problem.py
index dde3acf..89cf177 100644
--- a/judge/views/problem.py
+++ b/judge/views/problem.py
@@ -450,11 +450,11 @@ class ProblemPdfDescriptionView(ProblemMixin, SingleObjectMixin, View):
         if not problem.pdf_description:
             raise Http404()
         response = HttpResponse()
-        # if request.META.get("SERVER_SOFTWARE", "").startswith("nginx/"):
-        #    response["X-Accel-Redirect"] = problem.pdf_description.path
-        # else:
-        with open(problem.pdf_description.path, "rb") as f:
-            response.content = f.read()
+        if request.META.get("SERVER_SOFTWARE", "").startswith("nginx/"):
+            response["X-Accel-Redirect"] = problem.pdf_description.path
+        else:
+            with open(problem.pdf_description.path, "rb") as f:
+                response.content = f.read()
 
         response["Content-Type"] = "application/pdf"
         response["Content-Disposition"] = "inline; filename=%s.pdf" % (problem.code,)