1 files changed, 2 insertions, 0 deletions
diff --git a/gr-qtgui/lib/freq_sink_f_impl.h b/gr-qtgui/lib/freq_sink_f_impl.h
index ffb2c4bf5..8e3fbf1ed 100644
--- a/gr-qtgui/lib/freq_sink_f_impl.h
+++ b/gr-qtgui/lib/freq_sink_f_impl.h
@@ -78,6 +78,8 @@ namespace gr {
 		       QWidget *parent=NULL);
       ~freq_sink_f_impl();
 
+      bool check_topology(int ninputs, int noutputs);
+
       void exec_();
       QWidget*  qwidget();
       PyObject* pyqwidget();