diff --git a/include/pocketpy/obj.h b/include/pocketpy/obj.h
index fe549698..bf4f7968 100644
--- a/include/pocketpy/obj.h
+++ b/include/pocketpy/obj.h
@@ -122,17 +122,6 @@ struct PyObject{
     }
 };
 
-struct PySignalObject: PyObject {
-    PySignalObject() : PyObject(0) {
-        gc_enabled = false;
-    }
-    void _obj_gc_mark() override {}
-};
-
-inline PyObject* const PY_NULL = new PySignalObject();
-inline PyObject* const PY_OP_CALL = new PySignalObject();
-inline PyObject* const PY_OP_YIELD = new PySignalObject();
-
 const int kTpIntIndex = 2;
 const int kTpFloatIndex = 3;
 
@@ -349,4 +338,8 @@ struct Py_<DummyModule> final: PyObject {
     void _obj_gc_mark() override {}
 };
 
+extern PyObject* const PY_NULL;
+extern PyObject* const PY_OP_CALL;
+extern PyObject* const PY_OP_YIELD;
+
 }   // namespace pkpy
\ No newline at end of file
diff --git a/src/codeobject.cpp b/src/codeobject.cpp
index ef156c18..6185c8d0 100644
--- a/src/codeobject.cpp
+++ b/src/codeobject.cpp
@@ -23,4 +23,8 @@ namespace pkpy{
         this->argc = -1;
         this->decl = decl;
     }
+
+    PyObject* const PY_NULL = (PyObject*)new int(0);
+    PyObject* const PY_OP_CALL = (PyObject*)new int(1);
+    PyObject* const PY_OP_YIELD = (PyObject*)new int(2);
 }   // namespace pkpy
\ No newline at end of file