diff --git a/libs/ardour/plugin.cc b/libs/ardour/plugin.cc
index 2abb5cb130..7c312011be 100644
--- a/libs/ardour/plugin.cc
+++ b/libs/ardour/plugin.cc
@@ -40,7 +40,6 @@
 
 #include "pbd/compose.h"
 #include "pbd/error.h"
-#include "pbd/locale_guard.h"
 #include "pbd/xml++.h"
 
 #include "ardour/buffer_set.h"