diff --git a/components/detournavigator/navigatorimpl.cpp b/components/detournavigator/navigatorimpl.cpp
index b973747c9c..181e950fdc 100644
--- a/components/detournavigator/navigatorimpl.cpp
+++ b/components/detournavigator/navigatorimpl.cpp
@@ -16,7 +16,8 @@ namespace DetourNavigator
 
     void NavigatorImpl::addAgent(const AgentBounds& agentBounds)
     {
-        if (agentBounds.mHalfExtents.length2() <= 0)
+        if (agentBounds.mHalfExtents.x() == 0.f || agentBounds.mHalfExtents.y() == 0.f
+            || agentBounds.mHalfExtents.z() == 0.f)
             return;
         ++mAgents[agentBounds];
         mNavMeshManager.addAgent(agentBounds);