diff --git a/macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql b/macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql
index 1007150..98b1e61 100644
--- a/macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql
+++ b/macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql
@@ -16,7 +16,7 @@ with test_data as (
         count(distinct_values) as set_count_case_insensitive
     from
         test_data
-    group by 1
+    group by lower(distinct_values)
     having
         count(distinct_values) > 1