diff --git a/lib/libc/amd64/sys/amd64_get_fsbase.c b/lib/libc/amd64/sys/amd64_get_fsbase.c
--- a/lib/libc/amd64/sys/amd64_get_fsbase.c
+++ b/lib/libc/amd64/sys/amd64_get_fsbase.c
@@ -33,9 +33,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD	1
+#define _WANT_P_OSREL
 #include <sys/param.h>
-#undef IN_RTLD
 #include <machine/cpufunc.h>
 #include <machine/specialreg.h>
 #include <machine/sysarch.h>
diff --git a/lib/libc/amd64/sys/amd64_get_gsbase.c b/lib/libc/amd64/sys/amd64_get_gsbase.c
--- a/lib/libc/amd64/sys/amd64_get_gsbase.c
+++ b/lib/libc/amd64/sys/amd64_get_gsbase.c
@@ -33,9 +33,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD	1
+#define _WANT_P_OSREL
 #include <sys/param.h>
-#undef IN_RTLD
 #include <machine/cpufunc.h>
 #include <machine/specialreg.h>
 #include <machine/sysarch.h>
diff --git a/lib/libc/amd64/sys/amd64_set_fsbase.c b/lib/libc/amd64/sys/amd64_set_fsbase.c
--- a/lib/libc/amd64/sys/amd64_set_fsbase.c
+++ b/lib/libc/amd64/sys/amd64_set_fsbase.c
@@ -33,9 +33,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD	1
+#define _WANT_P_OSREL
 #include <sys/param.h>
-#undef IN_RTLD
 #include <machine/cpufunc.h>
 #include <machine/specialreg.h>
 #include <machine/sysarch.h>
diff --git a/lib/libc/amd64/sys/amd64_set_gsbase.c b/lib/libc/amd64/sys/amd64_set_gsbase.c
--- a/lib/libc/amd64/sys/amd64_set_gsbase.c
+++ b/lib/libc/amd64/sys/amd64_set_gsbase.c
@@ -33,9 +33,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD	1
+#define _WANT_P_OSREL
 #include <sys/param.h>
-#undef IN_RTLD
 #include <machine/cpufunc.h>
 #include <machine/specialreg.h>
 #include <machine/sysarch.h>
diff --git a/libexec/rtld-elf/amd64/reloc.c b/libexec/rtld-elf/amd64/reloc.c
--- a/libexec/rtld-elf/amd64/reloc.c
+++ b/libexec/rtld-elf/amd64/reloc.c
@@ -33,6 +33,7 @@
  * John Polstra <jdp@polstra.com>.
  */
 
+#define _WANT_P_OSREL
 #include <sys/param.h>
 #include <sys/mman.h>
 #include <machine/cpufunc.h>
diff --git a/libexec/rtld-elf/map_object.c b/libexec/rtld-elf/map_object.c
--- a/libexec/rtld-elf/map_object.c
+++ b/libexec/rtld-elf/map_object.c
@@ -27,6 +27,7 @@
  * $FreeBSD$
  */
 
+#define _WANT_P_OSREL
 #include <sys/param.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
diff --git a/sbin/fsck_ffs/main.c b/sbin/fsck_ffs/main.c
--- a/sbin/fsck_ffs/main.c
+++ b/sbin/fsck_ffs/main.c
@@ -43,7 +43,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD			/* So we pickup the P_OSREL defines */
+#define _WANT_P_OSREL
 #include <sys/param.h>
 #include <sys/file.h>
 #include <sys/mount.h>
diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -46,7 +46,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#define	IN_RTLD			/* So we pickup the P_OSREL defines */
+#define _WANT_P_OSREL
 #include <sys/param.h>
 #include <sys/disklabel.h>
 #include <sys/file.h>
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -94,7 +94,7 @@
 #undef __FreeBSD_kernel__
 #define __FreeBSD_kernel__
 
-#if defined(_KERNEL) || defined(IN_RTLD)
+#if defined(_KERNEL) || defined(_WANT_P_OSREL)
 #define	P_OSREL_SIGWAIT			700000
 #define	P_OSREL_SIGSEGV			700004
 #define	P_OSREL_MAP_ANON		800104