diff --git a/exhibit/core/generate/tests/test_missing.py b/exhibit/core/generate/tests/test_missing.py
index 002b3aa..38f2d63 100644
--- a/exhibit/core/generate/tests/test_missing.py
+++ b/exhibit/core/generate/tests/test_missing.py
@@ -84,7 +84,7 @@ def test_never_null_indices_are_identified(self):
 
         assert_series_equal(
             test_data.loc[result],
-            test_data.loc[[0, 1, 2, 4], "Num"])
+            test_data.loc[[0, 1, 2, 4], "Rum"])
 
     def test_paired_columns_with_missing_data_identified(self):
         '''