1diff --git a/hepmc/hepmcwrap.i b/hepmc/hepmcwrap.i
2index cf35c1b..b94fbe2 100644
3--- a/hepmc/hepmcwrap.i
4+++ b/hepmc/hepmcwrap.i
5@@ -1,6 +1,7 @@
6 %module hepmcwrap
7
8 %{
9+ #include "HepMC/Flow.h"
10 #include "HepMC/GenEvent.h"
11 #include "HepMC/GenVertex.h"
12 #include "HepMC/GenParticle.h"
13@@ -93,6 +94,7 @@ namespace HepMC {
14 // headers before importing headers that use those classes.
15 // Result is that headers should probably be %included in an order
16 // which sees "contents before containers"
17+%include "HepMC/Flow.h"
18 %include "HepMC/HepMCDefs.h"
19 %include "HepMC/SimpleVector.h"
20 // #ifdef HEPMC_HAS_ITERATOR_RANGES