diff --git a/Lib/python/pycontainer.swg b/Lib/python/pycontainer.swg
index b47601675..053ddab78 100644
--- a/Lib/python/pycontainer.swg
+++ b/Lib/python/pycontainer.swg
@@ -100,7 +100,7 @@ namespace swig {
 
 %fragment("PySequence_Base","header")
 {
-#include <functional>
+%#include <functional>
 
 namespace std {
   template <>