diff --git a/src/SpeedTrapListener.php b/src/SpeedTrapListener.php
index 9c151dd..f34bcd4 100644
--- a/src/SpeedTrapListener.php
+++ b/src/SpeedTrapListener.php
@@ -155,7 +155,7 @@ protected function toMilliseconds(float $time): int
      */
     protected function makeLabel(TestCase $test): string
     {
-        return sprintf('%s:%s', get_class($test), $test->getName());
+        return sprintf('%s::%s', get_class($test), $test->getName());
     }
 
     /**