diff --git a/weboob/backends/phpbb/backend.py b/weboob/backends/phpbb/backend.py
index 22f7dbbe..a5b96a1c 100644
--- a/weboob/backends/phpbb/backend.py
+++ b/weboob/backends/phpbb/backend.py
@@ -117,7 +117,7 @@ class PhpBBBackend(BaseBackend, ICapMessages):
         signature = post.signature
         if signature:
             signature += '<br />'
-        signature += 'URL: %s' % id2url('%s.%s' % (thread.id, post.id))
+        signature += 'URL: %s/%s' % (self.browser.absurl(id2url('%s.%s' % (thread.id, post.id))))
         return Message(thread=thread,
                        id=post.id,
                        title=post.title,
diff --git a/weboob/backends/phpbb/browser.py b/weboob/backends/phpbb/browser.py
index 82e10ae2..4d8139d0 100644
--- a/weboob/backends/phpbb/browser.py
+++ b/weboob/backends/phpbb/browser.py
@@ -48,6 +48,9 @@ class PhpBB(BaseBrowser):
         self.BASEPATH = v.path[:v.path.rfind('/')]
         BaseBrowser.__init__(self, *args, **kwargs)
 
+    def absurl(self, rel):
+        return BaseBrowser.absurl(self, '%s/%s' % (self.BASEPATH, rel))
+
     def home(self):
         self.location(self.url)
 
@@ -140,3 +143,6 @@ class PhpBB(BaseBrowser):
             post.parent = self.page.get_last_post_id()
 
         return post
+
+    def post_answer(self, topic, title, content):
+        pass