diff --git a/router_result.c b/router_result.c
index 8a03723..27760b1 100644
--- a/router_result.c
+++ b/router_result.c
@@ -144,11 +144,15 @@ static bool check_plan_invariants (plan_t *plan) {
             for (i_leg = 0; i_leg < itin->n_legs; ++i_leg) {
                 leg_t *leg = itin->legs + i_leg;
                 if (i_leg % 2 == 0) {
-                    if (leg->journey_pattern != WALK) fprintf(stderr, "even numbered leg %d has journey_pattern %d not WALK.\n", i_leg, leg->journey_pattern);
-                    fail = true;
+                    if (leg->journey_pattern != WALK) {
+                        fprintf(stderr, "even numbered leg %d has journey_pattern %d not WALK.\n", i_leg, leg->journey_pattern);
+                        fail = true;
+                    }
                 } else {
-                    if (leg->journey_pattern == WALK) fprintf(stderr, "odd numbered leg %d has journey_pattern WALK.\n", i_leg);
-                    fail = true;
+                    if (leg->journey_pattern == WALK) {
+                        fprintf(stderr, "odd numbered leg %d has journey_pattern WALK.\n", i_leg);
+                        fail = true;
+                    }
                 }
                 if (leg->t1 < leg->t0) {
                     fprintf(stderr, "non-increasing times within leg %d: %d, %d\n", i_leg, leg->t0, leg->t1);
@@ -316,7 +320,7 @@ bool router_result_to_plan (plan_t *plan, router_t *router, router_request_t *re
         plan->n_itineraries += 1;
         itin += 1;
     }
-    return check_plan_invariants (plan);
+    return !check_plan_invariants (plan);
 }
 
 /* After routing, call to convert the router state into a readable list of