diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -108,10 +108,6 @@
 SYSCTL_INT(_vm, OID_AUTO, imply_prot_max, CTLFLAG_RWTUN, &imply_prot_max, 0,
     "Imply maximum page protections in mmap() when none are specified");
 
-#ifdef MAP_32BIT
-#define	MAP_32BIT_MAX_ADDR	((vm_offset_t)1 << 31)
-#endif
-
 _Static_assert(MAXPAGESIZES <= 4, "MINCORE_SUPER too narrow");
 
 #ifndef _SYS_SYSPROTO_H_