diff --git a/drivers/usb/emul/sandbox_hub.c b/drivers/usb/emul/sandbox_hub.c
index 280c7080f2..baf8bdc857 100644
--- a/drivers/usb/emul/sandbox_hub.c
+++ b/drivers/usb/emul/sandbox_hub.c
@@ -32,6 +32,7 @@ static struct usb_string hub_strings[] = {
 	{STRING_MANUFACTURER,	"sandbox"},
 	{STRING_PRODUCT,	"hub"},
 	{STRING_SERIAL,		"2345"},
+	{},
 };
 
 static struct usb_device_descriptor hub_device_desc = {