diff --git a/opal/include/opal/types.h b/opal/include/opal/types.h
index 9cf1a6dc39..a00d1ae5e6 100644
--- a/opal/include/opal/types.h
+++ b/opal/include/opal/types.h
@@ -30,6 +30,9 @@
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
 
 #ifndef __WINDOWS__
 /*