diff --git a/src/physics/physical_object.cpp b/src/physics/physical_object.cpp
index 1e4b58f07..7f67cd85d 100644
--- a/src/physics/physical_object.cpp
+++ b/src/physics/physical_object.cpp
@@ -54,7 +54,8 @@ PhysicalObject::PhysicalObject(const XMLNode &xml_node)
     if     (shape=="cone"   ) m_body_type = MP_CONE;
     else if(shape=="box"    ) m_body_type = MP_BOX;
     else if(shape=="sphere" ) m_body_type = MP_SPHERE;
-
+    else fprintf(stderr, "Unknown shape type : %s\n", shape.c_str());
+    
     m_init_pos.setIdentity();
     m_init_pos.setOrigin(m_init_xyz);