diff --git a/sys/ufs/ffs/fs.h b/sys/ufs/ffs/fs.h
index dbefad3bef68..b62a80862ae3 100644
--- a/sys/ufs/ffs/fs.h
+++ b/sys/ufs/ffs/fs.h
@@ -34,6 +34,7 @@
 #define _UFS_FFS_FS_H_
 
 #include <sys/mount.h>
+#include <ufs/ufs/dinode.h>
 
 /*
  * Each disk drive contains some number of filesystems.