diff --git a/sys/fs/udf/udf_subr.c b/sys/fs/udf/udf_subr.c
index 9e2b9f6de7a8..ac5a14c51546 100644
--- a/sys/fs/udf/udf_subr.c
+++ b/sys/fs/udf/udf_subr.c
@@ -1,4 +1,4 @@
-/* $NetBSD: udf_subr.c,v 1.132 2015/08/24 08:31:56 hannken Exp $ */
+/* $NetBSD: udf_subr.c,v 1.133 2015/12/19 01:18:00 christos Exp $ */
 
 /*
  * Copyright (c) 2006, 2008 Reinoud Zandijk
@@ -29,7 +29,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: udf_subr.c,v 1.132 2015/08/24 08:31:56 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udf_subr.c,v 1.133 2015/12/19 01:18:00 christos Exp $");
 #endif /* not lint */
 
 
@@ -6462,8 +6462,8 @@ udf_read_internal(struct udf_node *node, uint8_t *blob)
 	assert(inflen < sector_size);
 
 	/* copy out info */
-	memset(blob, 0, sector_size);
 	memcpy(blob, pos, inflen);
+	memset(&blob[inflen] 0, sector_size - inflen);
 
 	return 0;
 }