diff --git a/orte/mca/pls/fork/pls_fork_module.c b/orte/mca/pls/fork/pls_fork_module.c
index 0a0be2d99f..92718be523 100644
--- a/orte/mca/pls/fork/pls_fork_module.c
+++ b/orte/mca/pls/fork/pls_fork_module.c
@@ -38,9 +38,12 @@
 #include <fcntl.h>
 #endif
 #include <time.h>
-#if HAVE_SYS_PARAM_H
+#ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
 
 #include "orte/orte_constants.h"
 #include "opal/event/event.h"