diff --git a/CHANGES b/CHANGES
index 8a198329..ef65fd37 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6,6 +6,7 @@ What's New for OpenJPEG
 + : added
 
 October 07, 2011
+* [mickael] WIP: correct mistake inside set_decoded_area function (credit to Francois De Vieilleville)
 + [mickael] WIP: backport rev 967-969 from opj-1.5 to trunk about test suite enhancement and rename of opj_configh.cmake.in
 
 October 06, 2011
diff --git a/libopenjpeg/j2k.c b/libopenjpeg/j2k.c
index 5cd36310..6d5b24e8 100644
--- a/libopenjpeg/j2k.c
+++ b/libopenjpeg/j2k.c
@@ -6085,7 +6085,7 @@ opj_bool j2k_set_decode_area(	opj_j2k_v2_t *p_j2k,
 		p_j2k->m_specific_param.m_decoder.m_end_tile_x = int_ceildiv((p_end_x - l_cp->tx0), l_cp->tdx);
 
 	/* Bottom */
-	if (p_end_x < l_cp->ty0) {
+	if (p_end_y < l_cp->ty0) {
 		opj_event_msg_v2(p_manager, EVT_ERROR,
 			"Right position of the decoded area (ROI_y1=%d) is outside the tile area (YTOsiz=%d).\n",
 			p_end_x, l_cp->ty0);