diff --git a/pack b/pack
index 5b18874..30e9552 100755
--- a/pack
+++ b/pack
@@ -42,8 +42,7 @@ for BRANCH in $TRUNK $BRANCHES; do
 		bfile=`basename $file`
 		echo -n "Processing catalog $bfile... ";
 		d=`echo "$bfile" | sed "s/.$LCODE.po//"`
-		$MSGMERGE --silent $file $file > $file.temp
-		mv $file.temp $file
+		$MSGMERGE --silent $file -U $file
 		if [ -f "$BRANCH/$d/$LCODE.po" ]; then
 			if ! $DIFF -q "$file" "$BRANCH/$d/$LCODE.po"  > /dev/null ; then
 				mkdir "$LCODE-temp/$d"