diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -73,7 +73,7 @@
  * cannot include sys/param.h and should only be updated here.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1500045
+#define __FreeBSD_version 1500046
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
@@ -107,6 +107,7 @@
 #define	P_OSREL_TIDPID			1400079
 #define	P_OSREL_ARM64_SPSR		1400084
 #define	P_OSREL_TLSBASE			1500044
+#define	P_OSREL_EXTERRCTL		1500046
 
 #define	P_OSREL_MAJOR(x)		((x) / 100000)
 #endif