diff --git a/sys/opensles/openslesringbuffer.c b/sys/opensles/openslesringbuffer.c
index 51477995c2..6e7f50ac81 100644
--- a/sys/opensles/openslesringbuffer.c
+++ b/sys/opensles/openslesringbuffer.c
@@ -21,6 +21,8 @@
 #  include <config.h>
 #endif
 
+#include <string.h>
+
 #include "opensles.h"
 #include "openslesringbuffer.h"