diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
index cb5a28373..9e35de186 100644
--- a/third_party/libopenjpeg20/j2k.c
+++ b/third_party/libopenjpeg20/j2k.c
@@ -2121,9 +2121,9 @@ static OPJ_BOOL opj_j2k_read_siz(opj_j2k_t *p_j2k,
                                   i, l_img_comp->dx, l_img_comp->dy);
                     return OPJ_FALSE;
                 }
-                if( l_img_comp->prec > 38) { /* TODO openjpeg won't handle more than ? */
+                if( l_img_comp->prec > 31) { /* TODO openjpeg won't handle more than ? */
                     opj_event_msg(p_manager, EVT_ERROR,
-                                  "Invalid values for comp = %d : prec=%u (should be between 1 and 38 according to the JPEG2000 norm)\n",
+                                  "Invalid values for comp = %d : prec=%u (should be between 1 and 31 according to the JPEG2000 norm)\n",
                                   i, l_img_comp->prec);
                     return OPJ_FALSE;
                 }