diff --git a/bootstrapform/templatetags/bootstrap.py b/bootstrapform/templatetags/bootstrap.py
index a8b96de..222d233 100644
--- a/bootstrapform/templatetags/bootstrap.py
+++ b/bootstrapform/templatetags/bootstrap.py
@@ -55,9 +55,7 @@ def add_input_classes(field):
 
 
 def render(element, markup_classes):
-    element_type = element.__class__.__name__.lower()
-
-    if element_type == 'boundfield':
+    if isinstance(element, forms.forms.BoundField):
         add_input_classes(element)
         template = get_template("bootstrapform/field.html")
         context = Context({'field': element, 'classes': markup_classes, 'form': element.form})