diff --git a/bureau/locales/Makefile b/bureau/locales/Makefile
index 9c30db3f..fbc458f3 100644
--- a/bureau/locales/Makefile
+++ b/bureau/locales/Makefile
@@ -2,8 +2,8 @@ all: messages.pot */LC_MESSAGES/messages.po */LC_MESSAGES/manual.po
 
 
 messages.pot: ../*/*.php
-	touch $@
-	xgettext --force-po --omit-header --keyword=__ --keyword=_  -L PHP --from-code iso-8859-1 -j $^
+	[ -r $@ ] || touch $@
+	xgettext --force-po --omit-header -o $@ --keyword=__ --keyword=_  -L PHP --from-code iso-8859-1 -j $^
 
 %/LC_MESSAGES/messages.po: messages.pot
 	msgmerge -v -U $@ $^