diff --git a/vim/after/syntax/c.vim b/vim/after/syntax/c.vim
index c6a748a..2effd5b 100644
--- a/vim/after/syntax/c.vim
+++ b/vim/after/syntax/c.vim
@@ -1,2 +1,3 @@
 syn keyword cType uchar ushort uint ulong
-
+syn keyword cType u8 u16 u32 u64
+syn keyword cType s8 s16 s32 s64