diff --git a/wagtail/utils/widgets.py b/wagtail/utils/widgets.py
index cc52ba1c9..6c232bb64 100644
--- a/wagtail/utils/widgets.py
+++ b/wagtail/utils/widgets.py
@@ -14,7 +14,7 @@ class WidgetWithScript(Widget):
         # so let's make sure it fails early in the process
         try:
             id_ = attrs['id']
-        except KeyError, TypeError:
+        except (KeyError, TypeError):
             raise TypeError("WidgetWithScript cannot be rendered without an 'id' attribute")
 
         widget_html = self.render_html(name, value, attrs)