diff --git a/build/build.xml b/build/build.xml
index 268f09d674..bc9240f37c 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -133,7 +133,7 @@
 	-->
 	<target name="export">
 		<exec dir="phpBB"
-			command="git archive ${revision} | tar -x -C ../${dir}"
+			command="git archive ${revision} | tar -xf - -C ../${dir}"
 			checkreturn="true" />
 		<delete file="${dir}/config.php" />
 		<delete dir="${dir}/develop" />
@@ -141,8 +141,8 @@
 
 		<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="${dir}" command="find -type d|xargs chmod 755" escape="false" />
+		<exec dir="${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" />