diff --git a/components/detournavigator/navmeshdata.hpp b/components/detournavigator/navmeshdata.hpp
index 501e971cba..6e400af3bc 100644
--- a/components/detournavigator/navmeshdata.hpp
+++ b/components/detournavigator/navmeshdata.hpp
@@ -20,7 +20,7 @@ namespace DetourNavigator
     struct NavMeshData
     {
         NavMeshDataValue mValue;
-        int mSize;
+        int mSize = 0;
 
         NavMeshData() = default;