diff --git a/libs/ardour/value_as_string.cc b/libs/ardour/value_as_string.cc
index 2dd2204555..55306d3f0b 100644
--- a/libs/ardour/value_as_string.cc
+++ b/libs/ardour/value_as_string.cc
@@ -18,6 +18,7 @@
 
 */
 
+#include "i18n.h"
 #include "ardour/value_as_string.h"
 
 namespace ARDOUR {