diff --git a/src/lib/openjp2/j2k.c b/src/lib/openjp2/j2k.c
index a9b42697..466e61b2 100644
--- a/src/lib/openjp2/j2k.c
+++ b/src/lib/openjp2/j2k.c
@@ -7619,6 +7619,7 @@ OPJ_BOOL opj_j2k_decode_tile (  opj_j2k_t * p_j2k,
                                                                 p_j2k->cstr_index) ) {
                 opj_j2k_tcp_destroy(l_tcp);
                 p_j2k->m_specific_param.m_decoder.m_state |= 0x8000;/*FIXME J2K_DEC_STATE_ERR;*/
+                opj_event_msg(p_manager, EVT_ERROR, "Failed to decode.\n");
                 return OPJ_FALSE;
         }
 
@@ -9120,6 +9121,7 @@ OPJ_BOOL opj_j2k_decode_tiles ( opj_j2k_t *p_j2k,
 
                 if (! opj_j2k_decode_tile(p_j2k,l_current_tile_no,l_current_data,l_data_size,p_stream,p_manager)) {
                         opj_free(l_current_data);
+                        opj_event_msg(p_manager, EVT_ERROR, "Failed to decode tile %d/%d\n", l_current_tile_no +1, p_j2k->m_cp.th * p_j2k->m_cp.tw);
                         return OPJ_FALSE;
                 }
                 opj_event_msg(p_manager, EVT_INFO, "Tile %d/%d has been decoded.\n", l_current_tile_no +1, p_j2k->m_cp.th * p_j2k->m_cp.tw);
diff --git a/src/lib/openjp2/t2.c b/src/lib/openjp2/t2.c
index 9cfc0363..dd5f9cc3 100644
--- a/src/lib/openjp2/t2.c
+++ b/src/lib/openjp2/t2.c
@@ -896,7 +896,7 @@ OPJ_BOOL opj_t2_read_packet_header( opj_t2_t* p_t2,
                         if (p_max_length < 2) {
                                 fprintf(stderr, "Not enough space for expected EPH marker\n");
                         } else if ((*l_header_data) != 0xff || (*(l_header_data + 1) != 0x92)) {
-                                printf("Error : expected EPH marker\n");
+                                fprintf(stderr, "Error : expected EPH marker\n");
                         } else {
                                 l_header_data += 2;
                         }
@@ -1224,6 +1224,8 @@ OPJ_BOOL opj_t2_skip_packet_data(   opj_t2_t* p_t2,
 
                         do {
                                 if (* p_data_read + l_seg->newlen > p_max_length) {
+                                        fprintf(stderr, "segment too long (%d) with max (%d) for codeblock %d (p=%d, b=%d, r=%d, c=%d)\n",
+                                                l_seg->newlen, p_max_length, cblkno, p_pi->precno, bandno, p_pi->resno, p_pi->compno);
                                         return OPJ_FALSE;
                                 }