diff --git a/src/object/function.cpp b/src/object/function.cpp
index ec787cf15..7b6ab9f08 100644
--- a/src/object/function.cpp
+++ b/src/object/function.cpp
@@ -586,6 +586,13 @@ BOOST_PYTHON_DECL void add_to_namespace(
 
 BOOST_PYTHON_DECL object const& add_doc(object const& attribute, char const* doc)
 {
+#if PY_VERSION_HEX >= 0x03000000
+    if (PyInstanceMethod_Check(attribute.ptr())) {
+#else
+    if (PyMethod_Check(attribute.ptr())) {
+#endif
+        return attribute;
+    }
     return function::add_doc(attribute, doc);
 }