diff --git a/track.c b/track.c
index caabcb1..a14474c 100644
--- a/track.c
+++ b/track.c
@@ -733,7 +733,7 @@ static unsigned compute_rc(unsigned metype, unsigned version, unsigned nic_a, un
             } else if (nic_a && nic_b) {
                 return 1112; // 1111.2m, 0.6NM
             } else {
-                return 1112; // bad combination, assume worst Rc
+                return RC_UNKNOWN; // bad combination
             }
         } else if (version == 1) {
             if (nic_a) {