diff --git a/include/gay/types.h b/include/gay/types.h
index 78df1e9..c866e6b 100644
--- a/include/gay/types.h
+++ b/include/gay/types.h
@@ -28,7 +28,7 @@ typedef __int32_t		i32;
 typedef __uint32_t		u32;
 
 typedef __int64_t		i64;
-typedef __int64_t		u64;
+typedef __uint64_t		u64;
 
 typedef __ssize_t		isize;
 typedef __size_t		usize;