diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -1034,7 +1034,7 @@
 	int error;
 	struct proc *p;
 
-	if (ngrp < 0 || ngrp >= ngroups_max)
+	if (ngrp < 0 || ngrp > ngroups_max)
 		return (EINVAL);
 	linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
 	error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
diff --git a/sys/compat/linux/linux_uid16.c b/sys/compat/linux/linux_uid16.c
--- a/sys/compat/linux/linux_uid16.c
+++ b/sys/compat/linux/linux_uid16.c
@@ -91,7 +91,7 @@
 	int error;
 	struct proc *p;
 
-	if (ngrp < 0 || ngrp >= ngroups_max)
+	if (ngrp < 0 || ngrp > ngroups_max)
 		return (EINVAL);
 	linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
 	error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));