diff --git a/src/internfile/mh_null.h b/src/internfile/mh_null.h
index b62453e1..952d6a2a 100644
--- a/src/internfile/mh_null.h
+++ b/src/internfile/mh_null.h
@@ -39,6 +39,10 @@ class MimeHandlerNull : public RecollFilter {
     }
     virtual ~MimeHandlerNull() {}
 
+    virtual bool is_data_input_ok(DataInput input) const {
+        return true;
+    }
+    
     virtual bool next_document() 
     {
 	if (m_havedoc == false)
diff --git a/src/internfile/mh_unknown.h b/src/internfile/mh_unknown.h
index 00b799a5..35ea7891 100644
--- a/src/internfile/mh_unknown.h
+++ b/src/internfile/mh_unknown.h
@@ -32,6 +32,10 @@ class MimeHandlerUnknown : public RecollFilter {
 	: 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;