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-rw-r--r--libs/ardour/tempo.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc
index 64964b29dd..c0e52279e1 100644
--- a/libs/ardour/tempo.cc
+++ b/libs/ardour/tempo.cc
@@ -35,6 +35,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
/* _default tempo is 4/4 qtr=120 */