diff --git a/src/Engine.cc b/src/Engine.cc
index 24e89fa..2909d0b 100644
--- a/src/Engine.cc
+++ b/src/Engine.cc
@@ -166,7 +166,6 @@ Engine::~Engine()
     {
         delete it->second;
     }
-    delete m_fileLoader;
     if (m_font != NULL)
         delete m_font;
 }
@@ -606,7 +605,7 @@ int Engine::loadModel(const string & name, bool is_static, bool is_reference,
 
         WFObj * obj = new WFObj();
 
-        if (obj->load(model_path, &::loadFile, &::loadTexture))
+        if (obj->load(model_path.c_str(), &::loadFile, &::loadTexture))
         {
             int id = addObject(obj, is_static, is_reference, enable_blending,
                     scale);
@@ -614,9 +613,10 @@ int Engine::loadModel(const string & name, bool is_static, bool is_reference,
             if (engine_obj != NULL)
             {
                 unsigned int size;
-                unsigned char *phy_data = loadFile(phys_path, &size);
+                const unsigned char *phy_data =
+                    loadFile(phys_path.c_str(), &size);
                 engine_obj->loadPhy(phy_data, size);
-                free(phy_data);
+                free((void *) phy_data);
             }
             return id;
         }
diff --git a/src/Engine.h b/src/Engine.h
index ed13ec4..fe148c7 100644
--- a/src/Engine.h
+++ b/src/Engine.h
@@ -33,7 +33,7 @@ class Engine
 
                 void setPosition(double x, double y, double z);
                 void getPosition(double * x, double * y, double * z);
-                void loadPhy(unsigned char *data, unsigned int size);
+                void loadPhy(const unsigned char *data, unsigned int size);
                 void instantiatePhy();
                 void setVisible(bool visible) { m_is_visible = visible; }
                 bool getVisible() { return m_is_visible; }
diff --git a/src/Engine_Object.cc b/src/Engine_Object.cc
index a8827c9..cf19feb 100644
--- a/src/Engine_Object.cc
+++ b/src/Engine_Object.cc
@@ -454,7 +454,7 @@ void Engine::Object::getPosition(double * x, double * y, double * z)
         *x = *y = *z = 0.0;
 }
 
-void Engine::Object::loadPhy(unsigned char *data, unsigned int size)
+void Engine::Object::loadPhy(const unsigned char *data, unsigned int size)
 {
     m_phy = new PhyObj();
     m_phy->load(data, size);