diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index fd7a693128..6007c3cf95 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -183,6 +183,7 @@ Region::register_properties ()
 	, _transient_user_start (0) \
 	, _transient_analysis_start (0) \
 	, _transient_analysis_end (0) \
+	, _soloSelected (false) \
 	, _muted (Properties::muted, false) \
 	, _opaque (Properties::opaque, true) \
 	, _locked (Properties::locked, false) \