diff --git a/3rd/box2d/src/box2d_Body.cpp b/3rd/box2d/src/box2d_Body.cpp
index a6b9cb8a..782c1aee 100644
--- a/3rd/box2d/src/box2d_Body.cpp
+++ b/3rd/box2d/src/box2d_Body.cpp
@@ -20,27 +20,27 @@ void PyBody::_register(VM* vm, PyObject* mod, PyObject* type){
             return obj;
         });
 
-    PK_REGISTER_PROPERTY(PyBody, "type: int", _b2Body, GetType, SetType)
-    PK_REGISTER_PROPERTY(PyBody, "gravity_scale: float", _b2Body, GetGravityScale, SetGravityScale)
-    PK_REGISTER_PROPERTY(PyBody, "fixed_rotation: bool", _b2Body, IsFixedRotation, SetFixedRotation)
-    PK_REGISTER_PROPERTY(PyBody, "enabled: bool", _b2Body, IsEnabled, SetEnabled)
-    PK_REGISTER_PROPERTY(PyBody, "bullet: bool", _b2Body, IsBullet, SetBullet)
+    PY_PROPERTY(PyBody, "type: int", _b2Body, GetType, SetType)
+    PY_PROPERTY(PyBody, "gravity_scale: float", _b2Body, GetGravityScale, SetGravityScale)
+    PY_PROPERTY(PyBody, "fixed_rotation: bool", _b2Body, IsFixedRotation, SetFixedRotation)
+    PY_PROPERTY(PyBody, "enabled: bool", _b2Body, IsEnabled, SetEnabled)
+    PY_PROPERTY(PyBody, "bullet: bool", _b2Body, IsBullet, SetBullet)
     
-    PK_REGISTER_READONLY_PROPERTY(PyBody, "mass: float", _b2Body, GetMass)
-    PK_REGISTER_READONLY_PROPERTY(PyBody, "inertia: float", _b2Body, GetInertia)
+    PY_READONLY_PROPERTY(PyBody, "mass: float", _b2Body, GetMass)
+    PY_READONLY_PROPERTY(PyBody, "inertia: float", _b2Body, GetInertia)
 
-    PK_REGISTER_PROPERTY(PyBody, "position: vec2", _, get_position, set_position)
-    PK_REGISTER_PROPERTY(PyBody, "rotation: float", _, get_rotation, set_rotation)
-    PK_REGISTER_PROPERTY(PyBody, "velocity: vec2", _, get_velocity, set_velocity)
-    PK_REGISTER_PROPERTY(PyBody, "angular_velocity: float", _b2Body, GetAngularVelocity, SetAngularVelocity)
-    PK_REGISTER_PROPERTY(PyBody, "damping: float", _b2Body, GetLinearDamping, SetLinearDamping)
-    PK_REGISTER_PROPERTY(PyBody, "angular_damping: float", _b2Body, GetAngularDamping, SetAngularDamping)
+    PY_PROPERTY(PyBody, "position: vec2", _, get_position, set_position)
+    PY_PROPERTY(PyBody, "rotation: float", _, get_rotation, set_rotation)
+    PY_PROPERTY(PyBody, "velocity: vec2", _, get_velocity, set_velocity)
+    PY_PROPERTY(PyBody, "angular_velocity: float", _b2Body, GetAngularVelocity, SetAngularVelocity)
+    PY_PROPERTY(PyBody, "damping: float", _b2Body, GetLinearDamping, SetLinearDamping)
+    PY_PROPERTY(PyBody, "angular_damping: float", _b2Body, GetAngularDamping, SetAngularDamping)
 
-    PK_REGISTER_PROPERTY(PyBody, "density: float", _b2Fixture, GetDensity, SetDensity)
-    PK_REGISTER_PROPERTY(PyBody, "friction: float", _b2Fixture, GetFriction, SetFriction)
-    PK_REGISTER_PROPERTY(PyBody, "restitution: float", _b2Fixture, GetRestitution, SetRestitution)
-    PK_REGISTER_PROPERTY(PyBody, "restitution_threshold: float", _b2Fixture, GetRestitutionThreshold, SetRestitutionThreshold)
-    PK_REGISTER_PROPERTY(PyBody, "is_sensor: bool", _b2Fixture, IsSensor, SetSensor)
+    PY_PROPERTY(PyBody, "density: float", _b2Fixture, GetDensity, SetDensity)
+    PY_PROPERTY(PyBody, "friction: float", _b2Fixture, GetFriction, SetFriction)
+    PY_PROPERTY(PyBody, "restitution: float", _b2Fixture, GetRestitution, SetRestitution)
+    PY_PROPERTY(PyBody, "restitution_threshold: float", _b2Fixture, GetRestitutionThreshold, SetRestitutionThreshold)
+    PY_PROPERTY(PyBody, "is_sensor: bool", _b2Fixture, IsSensor, SetSensor)
 
     vm->bind(type, "set_box_shape(self, hx: float, hy: float)",
         [](VM* vm, ArgsView args){
diff --git a/include/pocketpy/bindings.h b/include/pocketpy/bindings.h
index e357d7f5..1dd494f2 100644
--- a/include/pocketpy/bindings.h
+++ b/include/pocketpy/bindings.h
@@ -74,7 +74,7 @@ void _bind(VM* vm, PyObject* obj, const char* sig, Ret(T::*func)(Params...)){
     vm->bind(obj, sig, proxy_wrapper, proxy);
 }
 /*****************************************************************/
-#define PK_REGISTER_FIELD(T, NAME, REF, EXPR)       \
+#define PY_FIELD(T, NAME, REF, EXPR)       \
         vm->bind_property(type, NAME,               \
             [](VM* vm, ArgsView args){              \
                 T& self = _CAST(T&, args[0]);       \
@@ -86,14 +86,14 @@ void _bind(VM* vm, PyObject* obj, const char* sig, Ret(T::*func)(Params...)){
                 return vm->None;                                                \
             });
 
-#define PK_REGISTER_READONLY_FIELD(T, NAME, REF, EXPR)          \
+#define PY_READONLY_FIELD(T, NAME, REF, EXPR)          \
         vm->bind_property(type, NAME,                           \
             [](VM* vm, ArgsView args){              \
                 T& self = _CAST(T&, args[0]);       \
                 return VAR(self.REF().EXPR);        \
             });
 
-#define PK_REGISTER_PROPERTY(T, NAME, REF, FGET, FSET)  \
+#define PY_PROPERTY(T, NAME, REF, FGET, FSET)  \
         vm->bind_property(type, NAME,                   \
             [](VM* vm, ArgsView args){                  \
                 T& self = _CAST(T&, args[0]);           \
@@ -106,7 +106,7 @@ void _bind(VM* vm, PyObject* obj, const char* sig, Ret(T::*func)(Params...)){
                 return vm->None;                            \
             });
 
-#define PK_REGISTER_READONLY_PROPERTY(T, NAME, REF, FGET)  \
+#define PY_READONLY_PROPERTY(T, NAME, REF, FGET)  \
         vm->bind_property(type, NAME,                   \
             [](VM* vm, ArgsView args){                  \
                 T& self = _CAST(T&, args[0]);           \
diff --git a/src/pocketpy.cpp b/src/pocketpy.cpp
index 21f47947..c92cef1e 100644
--- a/src/pocketpy.cpp
+++ b/src/pocketpy.cpp
@@ -1445,15 +1445,15 @@ struct PyStructTime{
 
     static void _register(VM* vm, PyObject* mod, PyObject* type){
         vm->bind_notimplemented_constructor<PyStructTime>(type);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_year", _, tm_year);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_mon", _, tm_mon);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_mday", _, tm_mday);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_hour", _, tm_hour);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_min", _, tm_min);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_sec", _, tm_sec);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_wday", _, tm_wday);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_yday", _, tm_yday);
-        PK_REGISTER_READONLY_FIELD(PyStructTime, "tm_isdst", _, tm_isdst);
+        PY_READONLY_FIELD(PyStructTime, "tm_year", _, tm_year);
+        PY_READONLY_FIELD(PyStructTime, "tm_mon", _, tm_mon);
+        PY_READONLY_FIELD(PyStructTime, "tm_mday", _, tm_mday);
+        PY_READONLY_FIELD(PyStructTime, "tm_hour", _, tm_hour);
+        PY_READONLY_FIELD(PyStructTime, "tm_min", _, tm_min);
+        PY_READONLY_FIELD(PyStructTime, "tm_sec", _, tm_sec);
+        PY_READONLY_FIELD(PyStructTime, "tm_wday", _, tm_wday);
+        PY_READONLY_FIELD(PyStructTime, "tm_yday", _, tm_yday);
+        PY_READONLY_FIELD(PyStructTime, "tm_isdst", _, tm_isdst);
     }
 };