diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 8ada8be34d..eb1a1e7c46 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -33,7 +33,7 @@
 		<listener class="SpeedTrapListener" file="tests/phpunit/includes/listener-loader.php">
 			<arguments>
 				<array>
-					<element key="slow_threshold">
+					<element key="slowThreshold">
 						<integer>150</integer>
 					</element>
 				</array>