diff --git a/src/ast/data_type.rs b/src/ast/data_type.rs
index 33e153179..a602e247d 100644
--- a/src/ast/data_type.rs
+++ b/src/ast/data_type.rs
@@ -274,7 +274,7 @@ pub enum DataType {
     String(Option<u64>),
     /// A fixed-length string e.g [ClickHouse][1].
     ///
-    /// [1] https://clickhouse.com/docs/en/sql-reference/data-types/fixedstring
+    /// [1]: https://clickhouse.com/docs/en/sql-reference/data-types/fixedstring
     FixedString(u64),
     /// Bytea
     Bytea,
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 4f1bf7430..5194efd86 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -2236,9 +2236,10 @@ impl<'a> Parser<'a> {
     /// ```sql
     /// [field_name] field_type
     /// ```
-    /// [1] https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#declaring_a_struct_type
-    /// [2] https://clickhouse.com/docs/en/sql-reference/data-types/nested-data-structures/nested
-    /// [3] https://clickhouse.com/docs/en/sql-reference/data-types/tuple
+    ///
+    /// [1]: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#declaring_a_struct_type
+    /// [2]: https://clickhouse.com/docs/en/sql-reference/data-types/nested-data-structures/nested
+    /// [3]: https://clickhouse.com/docs/en/sql-reference/data-types/tuple
     fn parse_struct_field_def(
         &mut self,
         allow_anonymous: bool,
diff --git a/tests/sqlparser_clickhouse.rs b/tests/sqlparser_clickhouse.rs
index 9007e61e5..ab1dbf68d 100644
--- a/tests/sqlparser_clickhouse.rs
+++ b/tests/sqlparser_clickhouse.rs
@@ -263,9 +263,10 @@ fn parse_create_table_with_nullable() {
                         name: Ident::new("d"),
                         data_type: DataType::Date32,
                         collation: None,
-                        options: vec![
-                            ColumnOptionDef{name: None, option: ColumnOption::Null}
-                        ],
+                        options: vec![ColumnOptionDef {
+                            name: None,
+                            option: ColumnOption::Null
+                        }],
                     },
                 ]
             );