diff --git a/dbms/tests/queries/0_stateless/00434_tonullable.reference b/dbms/tests/queries/0_stateless/00434_tonullable.reference
new file mode 100644
index 00000000000..292b9490d95
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00434_tonullable.reference
@@ -0,0 +1 @@
+\N	Hello	1	\N	Hello	1	Null	Nullable(String)	Nullable(UInt8)	Null	Nullable(String)	Nullable(UInt8)
diff --git a/dbms/tests/queries/0_stateless/00434_tonullable.sql b/dbms/tests/queries/0_stateless/00434_tonullable.sql
new file mode 100644
index 00000000000..b9420ff7704
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00434_tonullable.sql
@@ -0,0 +1,13 @@
+SELECT
+    toNullable(NULL) AS a,
+    toNullable('Hello') AS b,
+    toNullable(toNullable(1)) AS c,
+    toNullable(materialize(NULL)) AS d,
+    toNullable(materialize('Hello')) AS e,
+    toNullable(toNullable(materialize(1))) AS f,
+    toTypeName(a),
+    toTypeName(b),
+    toTypeName(c),
+    toTypeName(d),
+    toTypeName(e),
+    toTypeName(f);