diff --git a/invokeai/app/models/image.py b/invokeai/app/models/image.py
index 1d493e65c2..544951ea34 100644
--- a/invokeai/app/models/image.py
+++ b/invokeai/app/models/image.py
@@ -28,6 +28,7 @@ class ImageCategory(str, Enum, metaclass=MetaEnum):
 
     GENERAL = "general"
     CONTROL = "control"
+    MASK = "mask"
     OTHER = "other"