diff --git a/src/Driver.php b/src/Driver.php
index 29545b2..a8a205a 100644
--- a/src/Driver.php
+++ b/src/Driver.php
@@ -78,7 +78,7 @@ public function getUpsertSQL(string $table, array $row): string;
      *
      * Example for MySQL: 'foo' => '`foo`'
      */
-    public function quoteIdentifier(string $name) : string;
+    public function quoteIdentifier(string $name): string;
 
     /**
      * Returns a quoted table identifier for the given table.
@@ -92,5 +92,5 @@ public function getTableIdentifier(Table $table): string;
      *
      * @param scalar|null $value
      */
-    public function quoteValue($value) : string;
+    public function quoteValue($value): string;
 }
diff --git a/src/Driver/MySQLDriver.php b/src/Driver/MySQLDriver.php
index b93561d..af65e47 100644
--- a/src/Driver/MySQLDriver.php
+++ b/src/Driver/MySQLDriver.php
@@ -216,7 +216,7 @@ public function getUpsertSQL(string $table, array $row): string
         return sprintf('INSERT INTO %s SET %s ON DUPLICATE KEY UPDATE %s;', $table, $values, $values);
     }
 
-    public function quoteIdentifier(string $name) : string
+    public function quoteIdentifier(string $name): string
     {
         return '`' . str_replace('`', '``', $name) . '`';
     }
@@ -226,7 +226,7 @@ public function getTableIdentifier(Table $table): string
         return $this->quoteIdentifier($table->schema) . '.' . $this->quoteIdentifier($table->name);
     }
 
-    public function quoteValue($value) : string
+    public function quoteValue($value): string
     {
         if ($value === null) {
             return 'NULL';