diff --git a/include/sys/types.h b/include/sys/types.h
index 270a43e46a..19cf76bb78 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -30,5 +30,6 @@ typedef unsigned int u_int, uint;
 typedef unsigned long u_long, ulong;
 typedef long long quad_t;
 typedef unsigned long long u_quad_t;
+typedef char *caddr_t;
 
 #endif /* _SYS_TYPES_H */