diff --git a/Include/code.h b/Include/code.h
index 38b2958..7456fd6 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -70,7 +70,7 @@
 /* Public interface */
 PyAPI_FUNC(PyCodeObject *) PyCode_New(
 	int, int, int, int, PyObject *, PyObject *, PyObject *, PyObject *,
-	PyObject *, PyObject *, PyObject *, PyObject *, int, PyObject *); 
+	PyObject *, PyObject *, PyObject *, PyObject *, int, PyObject *);
         /* same as struct above */
 
 /* Creates a new empty code object with the specified source location. */
@@ -98,6 +98,15 @@
 PyAPI_FUNC(int) _PyCode_CheckLineNumber(PyCodeObject* co,
                                         int lasti, PyAddrPair *bounds);
 
+/* Create a comparable key used to compare constants taking in account the
+ * object type. It is used to make sure types are not coerced (e.g., float and
+ * complex) _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms
+ *
+ * Return (type(obj), obj, ...): a tuple with variable size (at least 2 items)
+ * depending on the type and the value. The type is the first item to not
+ * compare bytes and str which can raise a BytesWarning exception. */
+PyAPI_FUNC(PyObject*) _PyCode_ConstantKey(PyObject *obj);
+
 PyAPI_FUNC(PyObject*) PyCode_Optimize(PyObject *code, PyObject* consts,
                                       PyObject *names, PyObject *lineno_obj);