diff --git a/tests/unit/test_hyper_transformer.py b/tests/unit/test_hyper_transformer.py
index e8ecac66a..1761ba90b 100644
--- a/tests/unit/test_hyper_transformer.py
+++ b/tests/unit/test_hyper_transformer.py
@@ -2896,7 +2896,8 @@ class DummyMultiColumnTransformer(BaseMultiColumnTransformer):
         # Run
         ht.update_sdtypes(column_name_to_sdtype={
             'column2': 'boolean',
-            'column1': 'boolean'
+            'column1': 'boolean',
+            'column4': 'categorical'
         })
 
         # Assert