diff --git a/build/build.xml b/build/build.xml
index ea12e60e3c..c1f81fb947 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -273,6 +273,22 @@
 		<delete dir="${dir}/develop" />
 		<delete dir="${dir}/install/data" />
 
+		<phingcall target="clean-vendor-dir">
+			<property name="dir" value="${dir}" />
+		</phingcall>
+
+		<echo msg="Setting permissions for checkout of ${revision} in ${dir}" />
+		<!-- set permissions of all files to 644, directories to 755 -->
+		<exec dir="${dir}" command="find . -type f|xargs chmod 644" escape="false" />
+		<exec dir="${dir}" command="find . -type d|xargs chmod 755" escape="false" />
+		<!-- set permissions of some directories to 777 -->
+		<chmod mode="0777" file="${dir}/cache" />
+		<chmod mode="0777" file="${dir}/store" />
+		<chmod mode="0777" file="${dir}/files" />
+		<chmod mode="0777" file="${dir}/images/avatars/upload" />
+	</target>
+
+	<target name="clean-vendor-dir">
 		<!-- Delete unrelated files from vendor/, see PHPBB3-12390 -->
 		<delete dir="${dir}/vendor/lusitanian/oauth/examples" />
 		<delete dir="${dir}/vendor/lusitanian/oauth/tests" />
@@ -355,16 +371,6 @@
 		<delete file="${dir}/vendor/twig/twig/CHANGELOG" />
 		<delete file="${dir}/vendor/twig/twig/phpunit.xml.dist" />
 		<delete file="${dir}/vendor/twig/twig/README.markdown" />
-
-		<echo msg="Setting permissions for checkout of ${revision} in ${dir}" />
-		<!-- set permissions of all files to 644, directories to 755 -->
-		<exec dir="${dir}" command="find . -type f|xargs chmod 644" escape="false" />
-		<exec dir="${dir}" command="find . -type d|xargs chmod 755" escape="false" />
-		<!-- set permissions of some directories to 777 -->
-		<chmod mode="0777" file="${dir}/cache" />
-		<chmod mode="0777" file="${dir}/store" />
-		<chmod mode="0777" file="${dir}/files" />
-		<chmod mode="0777" file="${dir}/images/avatars/upload" />
 	</target>
 
 	<target name="clean-diff-dir">