diff --git a/configure.ac b/configure.ac
index 082281a46a..e188bc900a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1001,6 +1001,7 @@ AC_CHECK_HEADERS(
         arpa/inet.h \
         net/if.h \
         netinet/in.h \
+        netinet/tcp.h \
         netdb.h \
         sys/sockio.h \
         sys/stat.h \
diff --git a/lib/connect.c b/lib/connect.c
index b5c90f5892..6f45e60d37 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -31,6 +31,8 @@
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
 #include <netinet/tcp.h> /* for TCP_NODELAY */
 #endif
 #include <sys/ioctl.h>