diff --git a/gtk2_ardour/mixer_strip.cc b/gtk2_ardour/mixer_strip.cc
index d21602894b..290081c2f1 100644
--- a/gtk2_ardour/mixer_strip.cc
+++ b/gtk2_ardour/mixer_strip.cc
@@ -77,7 +77,7 @@ PBD::Signal1<void,MixerStrip*> MixerStrip::CatchDeletion;
 MixerStrip::MixerStrip (Mixer_UI& mx, Session* sess, bool in_mixer)
 	: AxisView(sess)
 	, RouteUI (sess)
-	,_mixer(mx)
+	, _mixer(mx)
 	, _mixer_owned (in_mixer)
 	, processor_box (sess, boost::bind (&MixerStrip::plugin_selector, this), mx.selection(), this, in_mixer)
 	, gpm (sess, 250)
@@ -103,7 +103,7 @@ MixerStrip::MixerStrip (Mixer_UI& mx, Session* sess, bool in_mixer)
 MixerStrip::MixerStrip (Mixer_UI& mx, Session* sess, boost::shared_ptr<Route> rt, bool in_mixer)
 	: AxisView(sess)
 	, RouteUI (sess)
-	,_mixer(mx)
+	, _mixer(mx)
 	, _mixer_owned (in_mixer)
 	, processor_box (sess, sigc::mem_fun(*this, &MixerStrip::plugin_selector), mx.selection(), this, in_mixer)
 	, gpm (sess, 250)