diff --git a/src/insets/insetcollapsable.C b/src/insets/insetcollapsable.C
index e90fd05f51..d1e6949a5c 100644
--- a/src/insets/insetcollapsable.C
+++ b/src/insets/insetcollapsable.C
@@ -63,6 +63,23 @@ InsetCollapsable::InsetCollapsable
 }
 
 
+InsetCollapsable::InsetCollapsable(InsetCollapsable const & rhs):
+	InsetText(rhs), 	
+	labelfont_(rhs.labelfont_),
+	button_dim(rhs.button_dim),
+	topx(rhs.topx),
+	topbaseline(rhs.topbaseline),
+	label(rhs.label),
+	status_(rhs.status_),
+	openinlined_(rhs.openinlined_),
+	autoOpen_(rhs.autoOpen_),
+	textdim_(rhs.textdim_),
+	// the sole purpose of this copy constructor
+	mouse_hover_(false)
+{
+}
+
+
 void InsetCollapsable::write(Buffer const & buf, ostream & os) const
 {
 	os << "status ";
diff --git a/src/insets/insetcollapsable.h b/src/insets/insetcollapsable.h
index 5680dcb3a8..226083870e 100644
--- a/src/insets/insetcollapsable.h
+++ b/src/insets/insetcollapsable.h
@@ -42,6 +42,8 @@ public:
 	///
 	InsetCollapsable(BufferParams const &, CollapseStatus status = Open);
 	///
+	InsetCollapsable(InsetCollapsable const & rhs);
+	///
 	void read(Buffer const &, LyXLex &);
 	///
 	void write(Buffer const &, std::ostream &) const;