diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c
index e2d061aabf55..7ef580f5ac27 100644
--- a/sys/kern/kern_mib.c
+++ b/sys/kern/kern_mib.c
@@ -124,7 +124,7 @@ SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
     0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
 
-SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
+SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN,
     &ngroups_max, 0,
     "Maximum number of supplemental groups a user can belong to");