diff --git a/libs/ardour/panner.cc b/libs/ardour/panner.cc
index c94f668c85..9ad49c12c5 100644
--- a/libs/ardour/panner.cc
+++ b/libs/ardour/panner.cc
@@ -29,6 +29,7 @@ using namespace ARDOUR;
 
 Panner::Panner (boost::shared_ptr<Pannable> p)
 	: _pannable (p)
+	, _bypassed (false)
 {
 }