diff --git a/libctru/include/ctr/types.h b/libctru/include/ctr/types.h
index c272e53..a6832e1 100644
--- a/libctru/include/ctr/types.h
+++ b/libctru/include/ctr/types.h
@@ -16,6 +16,16 @@
 	typedef signed int s32;
 	typedef signed long long s64;
 
+	typedef volatile u8 vu8;
+	typedef volatile u16 vu16;
+	typedef volatile u32 vu32;
+	typedef volatile u64 vu64;
+
+	typedef volatile s8 vs8;
+	typedef volatile s16 vs16;
+	typedef volatile s32 vs32;
+	typedef volatile s64 vs64;
+
 	typedef u16 wchar;
 
 	typedef u32 Handle;