diff --git a/src/session.c b/src/session.c
index 51380d6..4fad934 100644
--- a/src/session.c
+++ b/src/session.c
@@ -227,14 +227,20 @@
 		if (p->options & PR_O_TCP_CLI_KA) {
 			setsockopt(cfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &one, sizeof(one));
 
+#ifdef TCP_KEEPCNT
 			if (p->clitcpka_cnt)
 				setsockopt(cfd, IPPROTO_TCP, TCP_KEEPCNT, &p->clitcpka_cnt, sizeof(p->clitcpka_cnt));
+#endif
 
+#ifdef TCP_KEEPIDLE
 			if (p->clitcpka_idle)
 				setsockopt(cfd, IPPROTO_TCP, TCP_KEEPIDLE, &p->clitcpka_idle, sizeof(p->clitcpka_idle));
+#endif
 
+#ifdef TCP_KEEPINTVL
 			if (p->clitcpka_intvl)
 				setsockopt(cfd, IPPROTO_TCP, TCP_KEEPINTVL, &p->clitcpka_intvl, sizeof(p->clitcpka_intvl));
+#endif
 		}
 
 		if (p->options & PR_O_TCP_NOLING)