diff --git a/core/view_surveys.py b/core/view_surveys.py
index 845cab2..db33557 100644
--- a/core/view_surveys.py
+++ b/core/view_surveys.py
@@ -173,7 +173,7 @@ def surveyscansfolder(request, path):
 def surveyscansingle(request, path, file):
     survexscansfolder = SurvexScansFolder.objects.get(walletname=urllib.parse.unquote(path))
     survexscansingle = SurvexScanSingle.objects.get(survexscansfolder=survexscansfolder, name=file)
-    return HttpResponse(content=open(survexscansingle.ffile), content_type=getMimeType(path.split(".")[-1]))
+    return HttpResponse(content=open(survexscansingle.ffile,"rb"), content_type=getMimeType(path.split(".")[-1]))
     #return render_to_response('survexscansfolder.html', { 'survexscansfolder':survexscansfolder, 'settings': settings })
     
 def surveyscansfolders(request):