diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h
index 502b5b9a9727..9e53550e1b04 100644
--- a/sys/vm/vm_map.h
+++ b/sys/vm/vm_map.h
@@ -223,8 +223,7 @@ struct vmspace {
 	int vm_refcnt;		/* number of references */
 	struct shmmap_state *vm_shm;	/* SYS5 shared memory private data XXX */
 /* we copy between vm_startcopy and vm_endcopy on fork */
-#define vm_startcopy vm_rssize
-	segsz_t vm_rssize;	/* current resident set size in pages */
+#define vm_startcopy vm_swrss
 	segsz_t vm_swrss;	/* resident set size before last swap */
 	segsz_t vm_tsize;	/* text size (pages) XXX */
 	segsz_t vm_dsize;	/* data size (pages) XXX */