diff --git a/CHANGES b/CHANGES
index 058da341..2e8fd599 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ What's New for OpenJPEG
 ! : changed
 + : added
 
+October 08, 2010
+* [antonin] fixed a bug in mj2.c that prevented extract_j2k_from_mj2 to build properly. Patch from winfried.
+
 October 04, 2010
 + [antonin] Added files to let people build openjpeg with 'configure' tools
 + [antonin] Added makefiles to let people manually build openjpeg on *nix platforms
diff --git a/mj2/mj2.c b/mj2/mj2.c
index 3111920a..7066ed08 100644
--- a/mj2/mj2.c
+++ b/mj2/mj2.c
@@ -1101,6 +1101,7 @@ int mj2_read_smj2(opj_image_t * img, mj2_tk_t * tk, opj_cio_t *cio)
   mj2_box_t box;
   mj2_box_t box2;
   int i;
+  struct extension ext;
 	
   mj2_read_boxhdr(&box, cio);
 	
@@ -1158,8 +1159,9 @@ int mj2_read_smj2(opj_image_t * img, mj2_tk_t * tk, opj_cio_t *cio)
   tk->or_fieldorder = 0;
 	
   cio_skip(cio,2);			/* Pre-defined = -1 */
+  memset(&ext, 0, sizeof(struct extension));
 	
-  if (!jp2_read_jp2h(&tk->jp2_struct, cio, NULL)) {
+  if (!jp2_read_jp2h(&tk->jp2_struct, cio, &ext)) {
 		opj_event_msg(tk->cinfo, EVT_ERROR, "Error reading JP2H Box\n");
     return 1;
   }