diff --git a/include/sys/types.h b/include/sys/types.h
index ec0455cdcf..d718ca0fad 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -58,7 +58,6 @@ typedef longlong_t			diskaddr_t;
 typedef ushort_t			o_mode_t;
 typedef uint_t				major_t;
 typedef uint_t				minor_t;
-typedef ulong_t				pfn_t;
 typedef ulong_t				pgcnt_t;
 typedef long				spgcnt_t;
 typedef short				index_t;