diff --git a/tests/integration_tests/db_engine_specs/bigquery_tests.py b/tests/integration_tests/db_engine_specs/bigquery_tests.py
index 5d0daf855e7b0..32e3d1f2067e5 100644
--- a/tests/integration_tests/db_engine_specs/bigquery_tests.py
+++ b/tests/integration_tests/db_engine_specs/bigquery_tests.py
@@ -77,6 +77,7 @@ def test_timegrain_expressions(self):
             "TIMESTAMP": "TIMESTAMP_TRUNC(temporal, HOUR)",
         }
         for type_, expected in test_cases.items():
+            col.type = type_
             actual = BigQueryEngineSpec.get_timestamp_expr(
                 col=col, pdf=None, time_grain="PT1H"
             )
@@ -99,6 +100,7 @@ def test_custom_minute_timegrain_expressions(self):
             ") AS TIMESTAMP)",
         }
         for type_, expected in test_cases.items():
+            col.type = type_
             actual = BigQueryEngineSpec.get_timestamp_expr(
                 col=col, pdf=None, time_grain="PT5M"
             )