diff --git a/types.h b/types.h
index f0780a4..cd25ff8 100644
--- a/types.h
+++ b/types.h
@@ -4,3 +4,4 @@ typedef unsigned char  u8;
 typedef unsigned short u16;
 typedef unsigned int   u32;
 typedef unsigned long  u64;
+typedef u64            size_t;