diff --git a/contrib/netbsd-tests/lib/libc/gen/t_cpuset.c b/contrib/netbsd-tests/lib/libc/gen/t_cpuset.c
--- a/contrib/netbsd-tests/lib/libc/gen/t_cpuset.c
+++ b/contrib/netbsd-tests/lib/libc/gen/t_cpuset.c
@@ -36,6 +36,46 @@
 #include <stdio.h>
 #include <sched.h>
 
+#ifdef __FreeBSD__
+#include <sys/cpuset.h>
+
+#include <stdlib.h>
+
+#define	cpuset_create()		calloc(1, sizeof(cpuset_t))
+#define	cpuset_destroy(cs)	free(cs)
+
+static inline int
+cpuset_set(size_t i, cpuset_t *cs)
+{
+
+	if (i > CPU_SETSIZE)
+		return (-1);
+	CPU_SET(i, cs);
+	return (0);
+}
+
+static inline int
+cpuset_clr(size_t i, cpuset_t *cs)
+{
+
+	if (i > CPU_SETSIZE)
+		return (-1);
+	CPU_CLR(i, cs);
+	return (0);
+}
+
+static inline int
+cpuset_isset(size_t i, cpuset_t *cs)
+{
+
+	if (i > CPU_SETSIZE)
+		return (-1);
+	return (CPU_ISSET(i, cs));
+}
+
+#define	cpuset_size(cs)		sizeof(*cs)
+#endif
+
 ATF_TC(cpuset_err);
 ATF_TC_HEAD(cpuset_err, tc)
 {
diff --git a/lib/libc/tests/gen/Makefile b/lib/libc/tests/gen/Makefile
--- a/lib/libc/tests/gen/Makefile
+++ b/lib/libc/tests/gen/Makefile
@@ -20,7 +20,7 @@
 ATF_TESTS_C+=		sigsetops_test
 ATF_TESTS_C+=		wordexp_test
 
-# TODO: t_closefrom, t_cpuset, t_fmtcheck, t_randomid,
+# TODO: t_closefrom, t_fmtcheck, t_randomid,
 # TODO: t_siginfo (fixes require further inspection)
 # TODO: t_sethostname_test (consistently screws up the hostname)
 
@@ -47,6 +47,7 @@
 NETBSD_ATF_TESTS_C=	alarm_test
 NETBSD_ATF_TESTS_C+=	assert_test
 NETBSD_ATF_TESTS_C+=	basedirname_test
+NETBSD_ATF_TESTS_C+=	cpuset_test
 NETBSD_ATF_TESTS_C+=	dir_test
 NETBSD_ATF_TESTS_C+=	floatunditf_test
 NETBSD_ATF_TESTS_C+=	fnmatch_test