diff --git a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/d/out.sql b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/d/out.sql
index 570242c295456..59d136762a046 100644
--- a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/d/out.sql
+++ b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/d/out.sql
@@ -1,2 +1,2 @@
 SELECT
-  toStartOfDay(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), DAY)"
\ No newline at end of file
+  CAST(toStartOfDay(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS Nullable(DateTime)) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), DAY)"
\ No newline at end of file
diff --git a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/w/out.sql b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/w/out.sql
index b6d895e7c92db..7a20e46b56524 100644
--- a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/w/out.sql
+++ b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/w/out.sql
@@ -1,2 +1,2 @@
 SELECT
-  toMonday(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), WEEK)"
\ No newline at end of file
+  CAST(toMonday(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS Nullable(DateTime)) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), WEEK)"
\ No newline at end of file
diff --git a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/y/out.sql b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/y/out.sql
index 634f92da101be..9ccea5d38a341 100644
--- a/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/y/out.sql
+++ b/ibis/backends/clickhouse/tests/snapshots/test_functions/test_timestamp_truncate/y/out.sql
@@ -1,2 +1,2 @@
 SELECT
-  toStartOfYear(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), YEAR)"
\ No newline at end of file
+  CAST(toStartOfYear(parseDateTimeBestEffort('2009-05-17T12:34:56')) AS Nullable(DateTime)) AS "TimestampTruncate(datetime.datetime(2009, 5, 17, 12, 34, 56), YEAR)"
\ No newline at end of file