diff --git a/orte/mca/ess/alps/ess_alps_module.c b/orte/mca/ess/alps/ess_alps_module.c
index 5edd9d7dab..6613e9bb16 100644
--- a/orte/mca/ess/alps/ess_alps_module.c
+++ b/orte/mca/ess/alps/ess_alps_module.c
@@ -29,6 +29,7 @@
 #include "orte/util/proc_info.h"
 #include "orte/mca/errmgr/base/base.h"
 #include "orte/util/name_fns.h"
+#include "orte/util/nidmap.h"
 #include "orte/runtime/orte_globals.h"
 
 #include "orte/mca/ess/ess.h"