diff --git a/finance/views.py b/finance/views.py
index ebd2c37..a4c70c1 100644
--- a/finance/views.py
+++ b/finance/views.py
@@ -173,7 +173,7 @@ def get_invoices(request):
     invoices = invoices.filter(date__gte=date_from) if date_from else invoices
 
     response = HttpResponse(content_type='text/csv')
-    response['Content-Disposition'] = 'attachment; filename="%s"' % file_name
+    response['Content-Disposition'] = 'attachment; filename="%s.csv"' % file_name
 
     writer = csv.writer(response)
     writer.writerow(['date', 'student_email', 'full_name', 'course', 'price', 'real_price', 'key'])