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-rw-r--r--libs/ardour/curve.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/curve.cc b/libs/ardour/curve.cc
index a515c3a39a..977b6dfd7b 100644
--- a/libs/ardour/curve.cc
+++ b/libs/ardour/curve.cc
@@ -38,6 +38,7 @@
using namespace std;
using namespace ARDOUR;
using namespace sigc;
+using namespace PBD;
Curve::Curve (double minv, double maxv, double canv, bool nostate)
: AutomationList (canv, nostate)