diff --git a/drivers/usb/gadget/f_thor.c b/drivers/usb/gadget/f_thor.c
index 6d38cb6..c8eda05 100644
--- a/drivers/usb/gadget/f_thor.c
+++ b/drivers/usb/gadget/f_thor.c
@@ -262,8 +262,10 @@ static long long int process_rqt_download(const struct rqt_box *rqt)
 
 	switch (rqt->rqt_data) {
 	case RQT_DL_INIT:
-		thor_file_size = rqt->int_data[0];
-		debug("INIT: total %d bytes\n", rqt->int_data[0]);
+		thor_file_size = (unsigned long long int)rqt->int_data[0] +
+				 (((unsigned long long int)rqt->int_data[1])
+				  << 32);
+		debug("INIT: total %llu bytes\n", thor_file_size);
 		break;
 	case RQT_DL_FILE_INFO:
 		file_type = rqt->int_data[0];
@@ -274,7 +276,9 @@ static long long int process_rqt_download(const struct rqt_box *rqt)
 			break;
 		}
 
-		thor_file_size = rqt->int_data[1];
+		thor_file_size = (unsigned long long int)rqt->int_data[1] +
+				 (((unsigned long long int)rqt->int_data[2])
+				  << 32);
 		memcpy(f_name, rqt->str_data[0], F_NAME_BUF_SIZE);
 		f_name[F_NAME_BUF_SIZE] = '\0';
 
diff --git a/drivers/usb/gadget/f_thor.h b/drivers/usb/gadget/f_thor.h
index 47abc8a..8ba3fa2 100644
--- a/drivers/usb/gadget/f_thor.h
+++ b/drivers/usb/gadget/f_thor.h
@@ -34,7 +34,7 @@ struct usb_cdc_attribute_vendor_descriptor {
 	__u8 DAUValue;
 } __packed;
 
-#define VER_PROTOCOL_MAJOR	4
+#define VER_PROTOCOL_MAJOR	5
 #define VER_PROTOCOL_MINOR	0
 
 enum rqt {