diff --git a/src/query/docseq.h b/src/query/docseq.h
index 38aedd88..0256e962 100644
--- a/src/query/docseq.h
+++ b/src/query/docseq.h
@@ -98,7 +98,7 @@ class DocSequence {
 	return doc.meta[Rcl::Doc::keyabs];
     }
 
-    virtual bool getEnclosing(Rcl::Doc&, Rcl::Doc&) {return false;}
+    virtual bool getEnclosing(Rcl::Doc&, Rcl::Doc&) = 0;
 
     /** Get estimated total count in results */
     virtual int getResCnt() = 0;
@@ -173,6 +173,12 @@ public:
 	    return false;
 	return m_seq->getTerms(terms, groups, gslks);
     }
+    virtual bool getEnclosing(Rcl::Doc& doc, Rcl::Doc& pdoc) 
+    {
+	if (m_seq.isNull())
+	    return false;
+	return m_seq->getEnclosing(doc, pdoc);
+    }
     virtual void getUTerms(vector<string>& terms)
     {
 	if (m_seq.isNull())