diff --git a/src/add-ons/kernel/file_systems/udf/UdfStructures.cpp b/src/add-ons/kernel/file_systems/udf/UdfStructures.cpp
index 60f863d5be..687449effc 100644
--- a/src/add-ons/kernel/file_systems/udf/UdfStructures.cpp
+++ b/src/add-ons/kernel/file_systems/udf/UdfStructures.cpp
@@ -5,12 +5,12 @@
 //  Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net
 //----------------------------------------------------------------------
 
-/*! \file DiskStructures.cpp
+/*! \file UdfStructures.cpp
 
 	UDF on-disk data structure definitions
 */
 
-#include "DiskStructures.h"
+#include "UdfStructures.h"
 
 #include <string.h>
 
@@ -192,6 +192,12 @@ entity_id::matches(const entity_id &id) const
 // extent_address
 //----------------------------------------------------------------------
 
+extent_address::extent_address(uint32 location, uint32 length)
+{
+	set_location(location);
+	set_length(length);
+}
+
 void
 extent_address::dump() const
 {
diff --git a/src/add-ons/kernel/file_systems/udf/UdfStructures.h b/src/add-ons/kernel/file_systems/udf/UdfStructures.h
index 8773f5070a..c70c154901 100644
--- a/src/add-ons/kernel/file_systems/udf/UdfStructures.h
+++ b/src/add-ons/kernel/file_systems/udf/UdfStructures.h
@@ -17,7 +17,7 @@
 
 #include "Array.h"
 
-/*! \file DiskStructures.h
+/*! \file UdfStructures.h
 
 	\brief UDF on-disk data structure declarations
 	
@@ -245,6 +245,8 @@ extern const char* kVSDID_ECMA168;
 */
 struct extent_address {
 public:
+	extent_address(uint32 location = 0, uint32 length = 0);
+
 	void dump() const;
 
 	uint32 length() const { return B_LENDIAN_TO_HOST_INT32(_length); }