diff --git a/gtk2_ardour/plugin_eq_gui.cc b/gtk2_ardour/plugin_eq_gui.cc
index e2606afc90..b46f17f920 100644
--- a/gtk2_ardour/plugin_eq_gui.cc
+++ b/gtk2_ardour/plugin_eq_gui.cc
@@ -54,6 +54,8 @@ PluginEqGui::PluginEqGui(boost::shared_ptr<ARDOUR::PluginInsert> pluginInsert)
 	: _min_dB(-12.0)
 	, _max_dB(+12.0)
 	, _step_dB(3.0)
+	, _buffer_size(0)
+	, _signal_buffer_size(0)
 	, _impulse_fft(0)
 	, _signal_input_fft(0)
 	, _signal_output_fft(0)