diff --git a/src/SpeedTrap.php b/src/SpeedTrap.php
index 3c0e162..9b84d2c 100644
--- a/src/SpeedTrap.php
+++ b/src/SpeedTrap.php
@@ -211,7 +211,7 @@ protected function renderBody(): void
             $time = array_shift($slowTests);
             $seconds = $time / 1000;
 
-            echo sprintf(" %s) %ss to run %s\n", $i, $seconds, $label);
+            echo sprintf(" %s) %.3fs to run %s\n", $i, $seconds, $label);
         }
     }