diff --git a/getloadavg.c b/getloadavg.c
index 0c4098d8..84000267 100644
--- a/getloadavg.c
+++ b/getloadavg.c
@@ -159,6 +159,9 @@ extern int errno;
 
 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
 #  define OSF_ALPHA
+#  include <sys/mbuf.h>
+#  include <sys/socket.h>
+#  include <net/route.h>
 #  include <sys/table.h>
 # endif