diff --git a/aksetup_helper.py b/aksetup_helper.py
index 85129cac3644cba8476c68f80218fa93c0a6dacb..755b0bc404405f654765ad712e739939f1a27762 100644
--- a/aksetup_helper.py
+++ b/aksetup_helper.py
@@ -573,7 +573,10 @@ def set_up_shipped_boost_if_requested(conf):
                     "bpl-subset/bpl_subset/libs/thread/src/pthread/*.cpp")
 
         return (source_files,
-                {"BOOST_MULTI_INDEX_DISABLE_SERIALIZATION": 1}
+                {
+                    "BOOST_MULTI_INDEX_DISABLE_SERIALIZATION": 1,
+                    "BOOST_PYTHON_SOURCE": 1,
+                    }
                 )
     else:
         return [], {}