diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
index 849d0b4..b20f219 100644
--- a/third_party/libopenjpeg20/j2k.c
+++ b/third_party/libopenjpeg20/j2k.c
@@ -5341,6 +5341,7 @@ static OPJ_BOOL opj_j2k_read_mcc (     opj_j2k_t *p_j2k,
         OPJ_UINT32 l_nb_collections;
         OPJ_UINT32 l_nb_comps;
         OPJ_UINT32 l_nb_bytes_by_comp;
+        OPJ_BOOL new_mcc = OPJ_FALSE;
 
         /* preconditions */
         assert(p_header_data != 00);
@@ -5402,6 +5403,7 @@ static OPJ_BOOL opj_j2k_read_mcc (     opj_j2k_t *p_j2k,
                         memset(l_mcc_record,0,(l_tcp->m_nb_max_mcc_records-l_tcp->m_nb_mcc_records) * sizeof(opj_simple_mcc_decorrelation_data_t));
                 }
                 l_mcc_record = l_tcp->m_mcc_records + l_tcp->m_nb_mcc_records;
+                new_mcc = OPJ_TRUE;
         }
         l_mcc_record->m_index = l_indix;
 
@@ -5537,7 +5539,9 @@ static OPJ_BOOL opj_j2k_read_mcc (     opj_j2k_t *p_j2k,
                 return OPJ_FALSE;
         }
 
-        ++l_tcp->m_nb_mcc_records;
+        if (new_mcc) {
+                ++l_tcp->m_nb_mcc_records;
+        }
 
         return OPJ_TRUE;
 }