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-rw-r--r--libs/ardour/region.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index 08df23146b..8c27a3bebc 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -37,6 +37,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
Change Region::FadeChanged = ARDOUR::new_change ();
Change Region::SyncOffsetChanged = ARDOUR::new_change ();