diff --git a/libs/ardour/ebur128_analysis.cc b/libs/ardour/ebur128_analysis.cc
index 4ddf004adf..3788e0207e 100644
--- a/libs/ardour/ebur128_analysis.cc
+++ b/libs/ardour/ebur128_analysis.cc
@@ -18,6 +18,8 @@
 */
 
 #include <cmath>
+#include <cstring>
+
 #include "ardour/ebur128_analysis.h"
 
 #include "i18n.h"