--- a/lib/blkid/getsize.c
+++ b/lib/blkid/getsize.c
@@ -29,6 +29,9 @@
#include <fcntl.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
+#ifdef __OpenBSD__
+#include <sys/dkio.h>
+#endif
#endif
#ifdef HAVE_LINUX_FD_H
#include <linux/fd.h>