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--- a/src/internfile/mh_unknown.h
+++ b/src/internfile/mh_unknown.h
@@ -32,6 +32,10 @@
 	: RecollFilter(cnf, id) {
     }
     virtual ~MimeHandlerUnknown() {}
+    virtual bool is_data_input_ok(DataInput input) const {
+        return true;
+    }
+    
     virtual bool next_document() {
 	if (m_havedoc == false)
 	    return false;