diff --git a/third_party/libopenjpeg20/jp2.c b/third_party/libopenjpeg20/jp2.c
index 3ace09654..7ef7c9139 100644
--- a/third_party/libopenjpeg20/jp2.c
+++ b/third_party/libopenjpeg20/jp2.c
@@ -1296,7 +1296,7 @@ static OPJ_BOOL opj_jp2_read_cmap(opj_jp2_t * jp2,
 
 
     for (i = 0; i < nr_channels; ++i) {
-        opj_read_bytes(p_cmap_header_data, &l_value, 2);            /* CMP^i */
+        opj_read_bytes_BE(p_cmap_header_data, &l_value, 2);     /* CMP^i */
         p_cmap_header_data += 2;
         cmap[i].cmp = (OPJ_UINT16) l_value;