diff --git a/sys/ufs/ffs/ffs_extern.h b/sys/ufs/ffs/ffs_extern.h
index fb026050ea7..fb1b1fb2bc6 100644
--- a/sys/ufs/ffs/ffs_extern.h
+++ b/sys/ufs/ffs/ffs_extern.h
@@ -33,6 +33,7 @@
 #ifndef _UFS_FFS_EXTERN_H
 #define	_UFS_FFS_EXTERN_H
 
+enum vtype;
 struct buf;
 struct cg;
 struct fid;