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-rw-r--r--gtk2_ardour/region_gain_line.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/region_gain_line.cc b/gtk2_ardour/region_gain_line.cc
index 059289acd4..bba9410ffb 100644
--- a/gtk2_ardour/region_gain_line.cc
+++ b/gtk2_ardour/region_gain_line.cc
@@ -16,6 +16,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
AudioRegionGainLine::AudioRegionGainLine (const string & name, Session& s, AudioRegionView& r, ArdourCanvas::Group& parent, Curve& c)
: AutomationLine (name, r.get_time_axis_view(), parent, c),