diff --git a/3rd/box2d/include/box2d_bindings.hpp b/3rd/box2d/include/box2d_bindings.hpp
index bf28697f..eb51424a 100644
--- a/3rd/box2d/include/box2d_bindings.hpp
+++ b/3rd/box2d/include/box2d_bindings.hpp
@@ -23,8 +23,6 @@ inline PyObject* py_var(VM* vm, b2Vec2 v){
     return py_var(vm, Vec2(v.x, v.y));
 }
 
-namespace imbox2d{
-
 inline PyObject* get_body_object(b2Body* p){
     auto userdata = p->GetUserData().pointer;
     return reinterpret_cast<PyObject*>(userdata);
@@ -111,7 +109,6 @@ struct PyBody{
     static void _register(VM* vm, PyObject* mod, PyObject* type);
 
     // methods
-
     b2Vec2 get_position() const { return body->GetPosition(); }
     void set_position(b2Vec2 v){ body->SetTransform(v, body->GetAngle()); }
     float get_rotation() const { return body->GetAngle(); }
@@ -148,12 +145,10 @@ struct PyWorld {
     static void _register(VM* vm, PyObject* mod, PyObject* type);
 };
 
-}   // namespace imbox2d
-
-
 inline void add_module_box2d(VM* vm){
     PyObject* mod = vm->new_module("box2d");
-    imbox2d::PyBody::register_class(vm, mod);
-    imbox2d::PyWorld::register_class(vm, mod);
+    PyBody::register_class(vm, mod);
+    PyWorld::register_class(vm, mod);
 }
+
 }   // namespace pkpy
\ No newline at end of file
diff --git a/3rd/box2d/src/box2d_Body.cpp b/3rd/box2d/src/box2d_Body.cpp
index 56b38f70..3d8f731a 100644
--- a/3rd/box2d/src/box2d_Body.cpp
+++ b/3rd/box2d/src/box2d_Body.cpp
@@ -4,7 +4,6 @@
 #include "pocketpy/bindings.h"
 
 namespace pkpy{
-namespace imbox2d{
 
 void PyBody::_register(VM* vm, PyObject* mod, PyObject* type){
     vm->bind(type, "__new__(cls, world: World, node: _NodeLike = None)",
@@ -84,5 +83,4 @@ void PyBody::_register(VM* vm, PyObject* mod, PyObject* type){
     });
 }
 
-}   // namespace imbox2d
 }   // namespace pkpy
\ No newline at end of file
diff --git a/3rd/box2d/src/box2d_World.cpp b/3rd/box2d/src/box2d_World.cpp
index 312fd3b0..c9c757aa 100644
--- a/3rd/box2d/src/box2d_World.cpp
+++ b/3rd/box2d/src/box2d_World.cpp
@@ -3,7 +3,6 @@
 #include "box2d_bindings.hpp"
 
 namespace pkpy{
-namespace imbox2d{
 
 struct MyRayCastCallback: b2RayCastCallback{
     PK_ALWAYS_PASS_BY_POINTER(MyRayCastCallback)
@@ -128,6 +127,4 @@ void PyWorld::_register(VM* vm, PyObject* mod, PyObject* type){
         return vm->None;
     });
 }
-
-}   // namespace imbox2d
 }   // namespace pkpy
\ No newline at end of file