diff --git a/nic3com.c b/nic3com.c
index 9772731..0b5433e 100644
--- a/nic3com.c
+++ b/nic3com.c
@@ -20,8 +20,10 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <errno.h>
-#include <sys/io.h>
 #include <pci/pci.h>
 #include "flash.h"
 
@@ -37,6 +39,10 @@
 uint32_t io_base_addr;
 struct pci_access *pacc;
 
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+int io_fd;
+#endif
+
 #define OK 0
 #define NT 1	/* Not tested */