diff --git a/nav2_smac_planner/src/collision_checker.cpp b/nav2_smac_planner/src/collision_checker.cpp
index 549570fb262..59e7f6760bb 100644
--- a/nav2_smac_planner/src/collision_checker.cpp
+++ b/nav2_smac_planner/src/collision_checker.cpp
@@ -97,7 +97,7 @@ bool GridCollisionChecker::inCollision(
   if (outsideRange(costmap_->getSizeInCellsX(), x) ||
     outsideRange(costmap_->getSizeInCellsY(), y))
   {
-    return false;
+    return true;
   }
 
   // Assumes setFootprint already set