diff --git a/lib/pangea/practice_activities/practice_activity_model.dart b/lib/pangea/practice_activities/practice_activity_model.dart
index 4e16f1099..eddbdacf1 100644
--- a/lib/pangea/practice_activities/practice_activity_model.dart
+++ b/lib/pangea/practice_activities/practice_activity_model.dart
@@ -306,6 +306,7 @@ sealed class MorphPracticeActivityModel
 }
 
 class MorphCategoryPracticeActivityModel extends MorphPracticeActivityModel {
+  final MorphExampleInfo morphExampleInfo;
   MorphCategoryPracticeActivityModel({
     required super.tokens,
     required super.langCode,