diff --git a/orte/mca/oob/tcp/oob_tcp_peer.c b/orte/mca/oob/tcp/oob_tcp_peer.c
index 20202b837b..0578a11ef2 100644
--- a/orte/mca/oob/tcp/oob_tcp_peer.c
+++ b/orte/mca/oob/tcp/oob_tcp_peer.c
@@ -50,6 +50,7 @@
 #include <netinet/tcp.h>
 #endif
 
+#include "opal/types.h"
 #include "opal/mca/backtrace/backtrace.h"
 #include "opal/util/if.h"
 #include "opal/util/output.h"