diff --git a/xlsform_app/views.py b/xlsform_app/views.py
index 731bf15..4ead3ce 100644
--- a/xlsform_app/views.py
+++ b/xlsform_app/views.py
@@ -18,7 +18,7 @@
 DJANGO_TMP_HOME = os.environ['DJANGO_TMP_HOME']
 
 class UploadFileForm(forms.Form):
-    file = forms.FileField()
+    file = forms.FileField(attrs={ 'accept': '.xls, .xlsx' })
 
 
 def clean_name(name):