diff --git a/libs/openengine/bullet/physic.cpp b/libs/openengine/bullet/physic.cpp
index f7caa54b4..1bc4341a0 100644
--- a/libs/openengine/bullet/physic.cpp
+++ b/libs/openengine/bullet/physic.cpp
@@ -488,7 +488,7 @@ namespace Physic
         dynamicsWorld->rayTest(from, to, resultCallback1);
         if (resultCallback1.hasHit())
         {
-            name = static_cast<RigidBody&>(*resultCallback1.m_collisionObject).mName;
+            name = static_cast<const RigidBody&>(*resultCallback1.m_collisionObject).mName;
             d1 = resultCallback1.m_closestHitFraction;
             d = d1;
         }
@@ -502,7 +502,7 @@ namespace Physic
             d2 = resultCallback1.m_closestHitFraction;
             if(d2<=d1)
             {
-                name = static_cast<PairCachingGhostObject&>(*resultCallback2.m_collisionObject).mName;
+                name = static_cast<const PairCachingGhostObject&>(*resultCallback2.m_collisionObject).mName;
                 d = d2;
             }
         }
@@ -515,25 +515,25 @@ namespace Physic
         MyRayResultCallback resultCallback1;
         resultCallback1.m_collisionFilterMask = COL_WORLD|COL_RAYCASTING;
         dynamicsWorld->rayTest(from, to, resultCallback1);
-        std::vector< std::pair<float, btCollisionObject*> > results = resultCallback1.results;
+        std::vector< std::pair<float, const btCollisionObject*> > results = resultCallback1.results;
 
         MyRayResultCallback resultCallback2;
         resultCallback2.m_collisionFilterMask = COL_ACTOR_INTERNAL|COL_ACTOR_EXTERNAL;
         dynamicsWorld->rayTest(from, to, resultCallback2);
-        std::vector< std::pair<float, btCollisionObject*> > actorResults = resultCallback2.results;
+        std::vector< std::pair<float, const btCollisionObject*> > actorResults = resultCallback2.results;
 
         std::vector< std::pair<float, std::string> > results2;
 
-        for (std::vector< std::pair<float, btCollisionObject*> >::iterator it=results.begin();
+        for (std::vector< std::pair<float, const btCollisionObject*> >::iterator it=results.begin();
             it != results.end(); ++it)
         {
-            results2.push_back( std::make_pair( (*it).first, static_cast<RigidBody&>(*(*it).second).mName ) );
+            results2.push_back( std::make_pair( (*it).first, static_cast<const RigidBody&>(*(*it).second).mName ) );
         }
 
-        for (std::vector< std::pair<float, btCollisionObject*> >::iterator it=actorResults.begin();
+        for (std::vector< std::pair<float, const btCollisionObject*> >::iterator it=actorResults.begin();
             it != actorResults.end(); ++it)
         {
-            results2.push_back( std::make_pair( (*it).first, static_cast<PairCachingGhostObject&>(*(*it).second).mName ) );
+            results2.push_back( std::make_pair( (*it).first, static_cast<const PairCachingGhostObject&>(*(*it).second).mName ) );
         }
 
         std::sort(results2.begin(), results2.end(), MyRayResultCallback::cmp);
diff --git a/libs/openengine/bullet/physic.hpp b/libs/openengine/bullet/physic.hpp
index 811572320..e327f24e1 100644
--- a/libs/openengine/bullet/physic.hpp
+++ b/libs/openengine/bullet/physic.hpp
@@ -278,7 +278,7 @@ namespace Physic
             return false;
         }
 
-        std::vector < std::pair<float, btCollisionObject*> > results;
+        std::vector < std::pair<float, const btCollisionObject*> > results;
     };
 
 }}