diff --git a/libs/surfaces/osc/osc.h b/libs/surfaces/osc/osc.h
index 197b0193ea..7f14a2e95e 100644
--- a/libs/surfaces/osc/osc.h
+++ b/libs/surfaces/osc/osc.h
@@ -37,6 +37,8 @@
 #include "ardour/types.h"
 #include "control_protocol/control_protocol.h"
 
+#include "i18n.h"
+
 class OSCControllable;
 class OSCRouteObserver;