diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 3f6dc71..4673157 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -159,7 +159,7 @@
 	char *nameptr;
 	uint8_t lfi;
 	uint16_t liu;
-	loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+	loff_t size;
 	kernel_lb_addr bloc, eloc;
 	uint32_t extoffset, elen, offset;
 	struct buffer_head *bh = NULL;
@@ -167,6 +167,8 @@
 	if (!dir)
 		return NULL;
 
+	size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+
 	f_pos = (udf_ext0_offset(dir) >> 2);
 
 	fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;