diff --git a/build.xml b/build.xml
index e79d1880..6b21e56c 100644
--- a/build.xml
+++ b/build.xml
@@ -25,6 +25,8 @@
 		<delete dir="${basedir}/build/coverage"/>
 		<delete dir="${basedir}/build/logs"/>
 		<delete dir="${basedir}/build/pdepend"/>
+		<delete dir="${basedir}/vendor"/>
+		<delete file="${basedir}/composer.lock"/>
 	</target>
 	
 	<target name="prepare" depends="clean" description="Prepare for build">