diff --git a/src/Physics/ObjectShapeGroup.h b/src/Physics/ObjectShapeGroup.h
index cca7d18c9..e05233434 100644
--- a/src/Physics/ObjectShapeGroup.h
+++ b/src/Physics/ObjectShapeGroup.h
@@ -82,4 +82,7 @@ typedef ObjectShapeGroup<3> ObjectShapeGroup3D;
 
 }}
 
+/* Make the definition complete */
+#include "ObjectShape.h"
+
 #endif