diff --git a/functions.h b/functions.h
index 4537acc1..908bfe33 100644
--- a/functions.h
+++ b/functions.h
@@ -91,7 +91,7 @@ class BoundFunction : public PythonObject
     
     BoundFunction(Ptr target, Ptr fn);
     PyObject* call(PyObject*args, PyObject* keywords) const;
-    PyObject* getattr(const char* name);
+    PyObject* getattr(const char* name) const;
     
  private:
     struct TypeObject;