diff --git a/src/EasySVG.php b/src/EasySVG.php
index 87de0ee..cb2c7ed 100644
--- a/src/EasySVG.php
+++ b/src/EasySVG.php
@@ -88,7 +88,7 @@ private function _utf8ToUnicode(?string $str): array
      * @param integer $size
      * @param string|null $color
      */
-    public function setFont(string $filepath, int $size, string $color = null): void
+    public function setFont(string $filepath, int $size, ?string $color = null): void
     {
         $this->setFontSVG($filepath);
         $this->setFontSize($size);