diff --git a/Utils/Converter/Measurement.php b/Utils/Converter/Measurement.php
index 8d12f314e..fab493926 100644
--- a/Utils/Converter/Measurement.php
+++ b/Utils/Converter/Measurement.php
@@ -945,7 +945,7 @@ class Measurement
      *
      * @since  1.0.0
      */
-    private static function normalizeSpeed(float $value, string $from) : from
+    private static function normalizeSpeed(float $value, string $from) : float
     {
         switch ($from) {
             case SpeedType::KILOMETERS_PER_HOUR: