diff --git a/module_usb_aud_shared/usb_buffer/xc_ptr.xc b/module_usb_aud_shared/usb_buffer/xc_ptr.xc
new file mode 100644
index 00000000..ee7ae963
--- /dev/null
+++ b/module_usb_aud_shared/usb_buffer/xc_ptr.xc
@@ -0,0 +1,3 @@
+#include "xc_ptr.h"
+
+extern inline xc_ptr array_to_xc_ptr(const unsigned a[]);