diff --git a/core/src/physics.h b/core/src/physics.h
index 0bc1569..84178fa 100644
--- a/core/src/physics.h
+++ b/core/src/physics.h
@@ -27,4 +27,7 @@ typedef struct PhysicsQuery {
     PhysicsMask mask;
 } PhysicsQuery;
 
+
+#define PHYSICS_LAYER_DEFAULT 0x1
+
 #endif // !_fencer_physics_h