diff --git a/src/openbsd.c b/src/openbsd.c
index 5be0a7cb..5a1d3213 100644
--- a/src/openbsd.c
+++ b/src/openbsd.c
@@ -56,6 +56,10 @@
 #include <net80211/ieee80211_ioctl.h>
 
 #include "conky.h"
+#include "diskio.h"
+#include "logging.h"
+#include "openbsd.h"
+#include "top.h"
 
 #define	MAXSHOWDEVS		16
 
@@ -659,6 +663,10 @@ void clear_diskio_stats()
 {
 }
 
+struct diskio_stat *prepare_diskio_stat(const char *s)
+{
+}
+
 void update_diskio()
 {
 	return;	/* XXX: implement? hifi: not sure how */
diff --git a/src/openbsd.h b/src/openbsd.h
index 273bc755..32aa8f4e 100644
--- a/src/openbsd.h
+++ b/src/openbsd.h
@@ -2,6 +2,7 @@
 #define OPENBSD_H_
 
 #include "common.h"
+#include <sys/param.h>
 #include <sys/sysctl.h>
 #include <sys/sensors.h>
 #include <machine/apmvar.h>