diff --git a/libs/ardour/audiorom.cc b/libs/ardour/audiorom.cc
index 4550ecf7f5..a5904cd353 100644
--- a/libs/ardour/audiorom.cc
+++ b/libs/ardour/audiorom.cc
@@ -16,6 +16,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <string.h>
+
 #include "pbd/failed_constructor.h"
 #include "ardour/audiorom.h"