1 files changed, 4 insertions, 0 deletions

diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
index b8af1a1..ce4fd31 100644
--- a/plugins/check_tcp.c
+++ b/plugins/check_tcp.c
@@ -449,7 +449,11 @@ process_arguments (int argc, char **argv)
                         address_family = AF_INET;
                         break;
                 case '6':
+#ifdef USE_IPV6
                         address_family = AF_INET6;
+#else
+                        usage ("IPv6 support not available\n");
+#endif
                         break;
                 case 'H':                 /* hostname */
                         if (is_host (optarg) == FALSE)