diff --git a/sdmetrics/utils.py b/sdmetrics/utils.py
index 30e56ebe..b50713ad 100644
--- a/sdmetrics/utils.py
+++ b/sdmetrics/utils.py
@@ -158,7 +158,7 @@ def fit(self, data):
             elif kind == 'O':
                 # Categorical column.
                 col_data = pd.DataFrame({'field': data[field]})
-                enc = OneHotEncoder()
+                enc = OneHotEncoder(handle_unknown='ignore')
                 enc.fit(col_data)
                 self.column_transforms[field] = {'one_hot_encoder': enc}
             elif kind == 'M':