diff --git a/Include/ceval.h b/Include/ceval.h
index 4e6889e..19ac064 100644
--- a/Include/ceval.h
+++ b/Include/ceval.h
@@ -22,6 +22,9 @@
 DL_IMPORT(PyObject *) PyEval_CallMethod(PyObject *obj,
                                         char *methodname, char *format, ...);
 
+DL_IMPORT(void) PyEval_SetProfile(Py_tracefunc, PyObject *);
+DL_IMPORT(void) PyEval_SetTrace(Py_tracefunc, PyObject *);
+
 DL_IMPORT(PyObject *) PyEval_GetBuiltins(void);
 DL_IMPORT(PyObject *) PyEval_GetGlobals(void);
 DL_IMPORT(PyObject *) PyEval_GetLocals(void);
diff --git a/Include/pystate.h b/Include/pystate.h
index 27ffe32..d5e2e1f 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -31,6 +31,15 @@
 
 struct _frame; /* Avoid including frameobject.h */
 
+/* Py_tracefunc return -1 when raising an exception, or 0 for success. */
+typedef int (*Py_tracefunc)(PyObject *, struct _frame *, int, PyObject *);
+
+/* The following values are used for 'what' for tracefunc functions: */
+#define PyTrace_CALL 0
+#define PyTrace_EXCEPTION 1
+#define PyTrace_LINE 2
+#define PyTrace_RETURN 3
+
 typedef struct _ts {
 
     struct _ts *next;
@@ -41,8 +50,10 @@
     int ticker;
     int tracing;
 
-    PyObject *sys_profilefunc;
-    PyObject *sys_tracefunc;
+    Py_tracefunc c_profilefunc;
+    Py_tracefunc c_tracefunc;
+    PyObject *c_profileobj;
+    PyObject *c_traceobj;
 
     PyObject *curexc_type;
     PyObject *curexc_value;