diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index cd5532398c15144ca4025cc358f4ec7c036f7d17..9d52897c1b6d86aca8bd2f620e4283f1a19a3a44 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -449,8 +449,7 @@ static int coda_venus_readdir(struct file *coda_file, void *buf,
 	struct file *host_file;
 	struct dentry *de;
 	struct venus_dirent *vdir;
-	unsigned long vdir_size =
-	    (unsigned long)(&((struct venus_dirent *)0)->d_name);
+	unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
 	unsigned int type;
 	struct qstr name;
 	ino_t ino;