diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index 41d160ddd7..78d805815b 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -495,7 +495,7 @@ Region::set_length_internal (timecnt_t const & len)
 
 	l.set_position (position());
 
-	_last_length = l;
+	_last_length = _length;
 	_length = l;
 }