diff --git a/Lib/python/pycontainer.swg b/Lib/python/pycontainer.swg
index a748f32e3..9c96d0cbc 100644
--- a/Lib/python/pycontainer.swg
+++ b/Lib/python/pycontainer.swg
@@ -102,7 +102,7 @@ namespace swig {
 } 
 }
 
-%fragment("SwigPySequence_Base","header",fragment="StdTraits")
+%fragment("SwigPySequence_Base","header",fragment="<stddef.h>",fragment="StdTraits")
 {
 %#include <functional>