diff --git a/build.xml b/build.xml
index 150eebdc..e489f847 100644
--- a/build.xml
+++ b/build.xml
@@ -241,7 +241,7 @@
 
 	<target name="phpunit" unless="phpunit.done" depends="phpunit-prepare"
 		description="Run unit tests with PHPUnit">
-		<exec executable="${phpunit}" resultproperty="result.phpunit"
+		<exec executable="${phpunit}" failonerror="true" resultproperty="result.phpunit"
 			taskname="phpunit">
 			<arg value="--configuration" />
 			<arg path="${basedir}/phpunit.xml" />