diff --git a/regnual/types.h b/regnual/types.h
index 6b727bf..ed28a12 100644
--- a/regnual/types.h
+++ b/regnual/types.h
@@ -7,4 +7,6 @@ typedef unsigned int uint32_t;
 #define TRUE  1
 #define FALSE 0
 
+#define NULL  0
+
 #define     __IO    volatile
diff --git a/src/usb_lld.c b/src/usb_lld.c
index 578f764..5fc9bac 100644
--- a/src/usb_lld.c
+++ b/src/usb_lld.c
@@ -839,6 +839,7 @@ static void handle_setup0 (void)
   pw++;
   ctrl_p->wLength = *pw;
 
+  data_p->addr = NULL;
   data_p->len = 0;
   data_p->offset = 0;