diff --git a/src/QROptionsTrait.php b/src/QROptionsTrait.php
index 69c8b1a54..75db6ae1a 100644
--- a/src/QROptionsTrait.php
+++ b/src/QROptionsTrait.php
@@ -308,6 +308,8 @@ trait QROptionsTrait{
 
 	/**
 	 * sets the FPDF measurement unit
+	 *
+	 * @codeCoverageIgnore
 	 */
 	protected function set_fpdfMeasureUnit(string $unit):void{
 		$unit = strtolower($unit);