diff --git a/web/src/toga_web/factory.py b/web/src/toga_web/factory.py
index be253f674f..8ca7af7735 100644
--- a/web/src/toga_web/factory.py
+++ b/web/src/toga_web/factory.py
@@ -8,6 +8,7 @@
 
 # from .images import Image
 from .paths import Paths
+from .widgets.activityindicator import ActivityIndicator
 from .widgets.box import Box
 from .widgets.button import Button
 
@@ -64,6 +65,7 @@ def not_implemented(feature):
     # 'OptionContainer',
     # 'PasswordInput',
     "ProgressBar",
+    "ActivityIndicator",
     # 'ScrollContainer',
     # 'Selection',
     # 'Slider',