diff --git a/src/post.h b/src/post.h
index 3206afdd..55ca08e4 100644
--- a/src/post.h
+++ b/src/post.h
@@ -106,7 +106,7 @@ public:
   virtual string description() {
     if (pos) {
       std::ostringstream buf;
-      buf << _f("posting at line %1") << pos->beg_line;
+      buf << _f("posting at line %1%") % pos->beg_line;
       return buf.str();
     } else {
       return string(_("generated posting"));