diff --git a/trunk/paradiseo-moeo/src/fitness/moeoDominanceRankFitnessAssignment.h b/trunk/paradiseo-moeo/src/fitness/moeoDominanceRankFitnessAssignment.h
index e67d76658..e265b94c1 100644
--- a/trunk/paradiseo-moeo/src/fitness/moeoDominanceRankFitnessAssignment.h
+++ b/trunk/paradiseo-moeo/src/fitness/moeoDominanceRankFitnessAssignment.h
@@ -43,6 +43,7 @@
 #include <vector>
 #include <eoPop.h>
 #include <archive/moeoArchive.h>
+#include <archive/moeoUnboundedArchive.h>
 #include <comparator/moeoObjectiveVectorComparator.h>
 #include <comparator/moeoParetoObjectiveVectorComparator.h>
 #include <fitness/moeoDominanceBasedFitnessAssignment.h>