diff --git a/sys/sys/_types.h b/sys/sys/_types.h
--- a/sys/sys/_types.h
+++ b/sys/sys/_types.h
@@ -72,15 +72,11 @@
 typedef	__int64_t	__intfptr_t;
 typedef	__uint64_t	__uintptr_t;
 typedef	__uint64_t	__uintfptr_t;
-typedef	__uint64_t	__vm_offset_t;
-typedef	__uint64_t	__vm_size_t;
 #elif __SIZEOF_POINTER__ == 4
 typedef	__int32_t	__intptr_t;
 typedef	__int32_t	__intfptr_t;
 typedef	__uint32_t	__uintptr_t;
 typedef	__uint32_t	__uintfptr_t;
-typedef	__uint32_t	__vm_offset_t;
-typedef	__uint32_t	__vm_size_t;
 #else
 #error unsupported pointer size
 #endif
@@ -109,6 +105,9 @@
 typedef	__size_t		__ptraddr_t;
 #endif
 
+typedef	__ptraddr_t	__vm_offset_t;
+typedef	__size_t	__vm_size_t;
+
 /*
  * Target-dependent type definitions.
  */