diff --git a/src/parser/Tree.cpp b/src/parser/Tree.cpp
index ac7d399db..f0897d88f 100644
--- a/src/parser/Tree.cpp
+++ b/src/parser/Tree.cpp
@@ -177,6 +177,20 @@ void Tree::tag (const std::string& tag)
     _tags.push_back (tag);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Tree::unTag (const std::string& tag)
+{
+  std::vector <std::string>::iterator i;
+  for (i = _tags.begin (); i != _tags.end (); ++i)
+  {
+    if (*i == tag)
+    {
+      _tags.erase (i);
+      break;
+    }
+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int Tree::count () const
 {
diff --git a/src/parser/Tree.h b/src/parser/Tree.h
index 28951e8cc..19c36c884 100644
--- a/src/parser/Tree.h
+++ b/src/parser/Tree.h
@@ -55,6 +55,7 @@ public:
 
   bool hasTag (const std::string&) const;
   void tag (const std::string&);
+  void unTag (const std::string&);
 
   int count () const;