diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c
--- a/sys/kern/kern_mib.c
+++ b/sys/kern/kern_mib.c
@@ -318,6 +318,9 @@
     CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A",
     "System architecture");
 
+SYSCTL_STRING(_hw, HW_MACHINE_REAL_ARCH, machine_real_arch, CTLFLAG_RD | CTLFLAG_MPSAFE,
+    MACHINE_ARCH, 0, "System architecture (not altered by ABI of the caller)");
+
 #ifndef MACHINE_ARCHES
 #ifdef COMPAT_FREEBSD32
 #define	MACHINE_ARCHES	MACHINE_ARCH " " MACHINE_ARCH32
diff --git a/sys/sys/sysctl.h b/sys/sys/sysctl.h
--- a/sys/sys/sysctl.h
+++ b/sys/sys/sysctl.h
@@ -1041,6 +1041,7 @@
 #define	HW_FLOATINGPT	10		/* int: has HW floating point? */
 #define	HW_MACHINE_ARCH	11		/* string: machine architecture */
 #define	HW_REALMEM	12		/* int: 'real' memory */
+#define	HW_MACHINE_REAL_ARCH	11	/* string: machine architecture */
 
 /*
  * CTL_USER definitions