diff --git a/build.xml b/build.xml
index bac41ff99..f6478e432 100644
--- a/build.xml
+++ b/build.xml
@@ -124,9 +124,9 @@
  <target name="phpunit" description="Run unit tests with PHPUnit">
   <exec executable="phpunit">
     <arg value="--testsuite" />
-    <arg path="api" />
+    <arg value="api" />
     <arg value="--bootstrap" />
-    <arg path="${basedir}/workflow/engine/src/Tests/bootstrap.php" />
+    <arg value="${basedir}/workflow/engine/src/Tests/bootstrap.php" />
   </exec>
  </target>