diff --git a/libs_required/ACG/Geometry/bsp/BSPImplT.hh b/libs_required/ACG/Geometry/bsp/BSPImplT.hh
index 6d838480d38cf2dfaf063d6ed57e2b7bd948acd8..3dc3ef38c7b06319d57af27410819072d8687aca 100644
--- a/libs_required/ACG/Geometry/bsp/BSPImplT.hh
+++ b/libs_required/ACG/Geometry/bsp/BSPImplT.hh
@@ -179,6 +179,8 @@ private: //---------------------------------------------------------------------
   /// Store ray collide information
   struct RayCollisionData
   {
+    RayCollisionData() : ref(), ray() {}
+
     Point   ref;
     Point   ray;
     RayCollision hit_handles;