--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -1,6 +1,7 @@
 #ifndef _LINUX_TYPES_H
 #define _LINUX_TYPES_H
 
+typedef unsigned long long __u64;
 #include <linux/posix_types.h>
 #include <asm/types.h>
 #include <stdbool.h>