diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 9ed966a6ed..4e654e11d8 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -2283,6 +2283,10 @@ isc__nm_socket_dontfrag(uv_os_sock_t fd, sa_family_t sa_family) {
 #define TIMEOUT_TYPE	unsigned int
 #define TIMEOUT_DIV	1
 #define TIMEOUT_OPTNAME TCP_USER_TIMEOUT
+#elif defined(TCP_KEEPINIT)
+#define TIMEOUT_TYPE	int
+#define TIMEOUT_DIV	1000
+#define TIMEOUT_OPTNAME TCP_KEEPINIT
 #endif
 
 isc_result_t
diff --git a/lib/isc/tests/tcp_quota_test.c b/lib/isc/tests/tcp_quota_test.c
index 0602dea28a..849213b677 100644
--- a/lib/isc/tests/tcp_quota_test.c
+++ b/lib/isc/tests/tcp_quota_test.c
@@ -9,7 +9,7 @@
  * information regarding copyright ownership.
  */
 
-#if HAVE_CMOCKA && defined(__linux__)
+#if HAVE_CMOCKA
 #include <sched.h> /* IWYU pragma: keep */
 #include <setjmp.h>
 #include <stdarg.h>
diff --git a/lib/isc/tests/tcp_test.c b/lib/isc/tests/tcp_test.c
index 4c4fea0532..a27ab80ebb 100644
--- a/lib/isc/tests/tcp_test.c
+++ b/lib/isc/tests/tcp_test.c
@@ -9,7 +9,7 @@
  * information regarding copyright ownership.
  */
 
-#if HAVE_CMOCKA && defined(__linux__)
+#if HAVE_CMOCKA
 #include <sched.h> /* IWYU pragma: keep */
 #include <setjmp.h>
 #include <stdarg.h>
diff --git a/lib/isc/tests/tcpdns_test.c b/lib/isc/tests/tcpdns_test.c
index c21a7cb73c..2145964592 100644
--- a/lib/isc/tests/tcpdns_test.c
+++ b/lib/isc/tests/tcpdns_test.c
@@ -9,7 +9,7 @@
  * information regarding copyright ownership.
  */
 
-#if HAVE_CMOCKA && defined(__linux__)
+#if HAVE_CMOCKA
 #include <sched.h> /* IWYU pragma: keep */
 #include <setjmp.h>
 #include <stdarg.h>
diff --git a/lib/isc/tests/udp_test.c b/lib/isc/tests/udp_test.c
index b3062cc465..a1a99314e2 100644
--- a/lib/isc/tests/udp_test.c
+++ b/lib/isc/tests/udp_test.c
@@ -9,7 +9,7 @@
  * information regarding copyright ownership.
  */
 
-#if HAVE_CMOCKA && defined(__linux__)
+#if HAVE_CMOCKA
 #include <sched.h> /* IWYU pragma: keep */
 #include <setjmp.h>
 #include <stdarg.h>