diff --git a/util-linux/fdisk_osf.c b/util-linux/fdisk_osf.c
index 1141b78..1328c1f 100644
--- a/util-linux/fdisk_osf.c
+++ b/util-linux/fdisk_osf.c
@@ -709,6 +709,9 @@
 static void
 xbsd_write_bootstrap(void)
 {
+#ifndef MAXPATHLEN
+# define MAXPATHLEN 1024
+#endif
 	char path[MAXPATHLEN];
 	const char *bootdir = BSD_LINUX_BOOTDIR;
 	const char *dkbasename;