diff --git a/std/inpc/walking.c b/std/inpc/walking.c
index 1fe19a4..eef8977 100644
--- a/std/inpc/walking.c
+++ b/std/inpc/walking.c
@@ -117,13 +117,17 @@
 }
 
 int walk_route() {
+  return 0;
 }
 
 int walk_to() {
+  return 0;
 }
 
 int walk_follow() {
+  return 0;
 }
 
 int walk_flee() {
+  return 0;
 }