diff -rupN --no-dereference openjpeg-2.3.1/src/lib/openjp2/dwt.c openjpeg-2.3.1-new/src/lib/openjp2/dwt.c
--- openjpeg-2.3.1/src/lib/openjp2/dwt.c	2019-04-02 14:45:15.000000000 +0200
+++ openjpeg-2.3.1-new/src/lib/openjp2/dwt.c	2020-12-17 16:25:44.842030417 +0100
@@ -1293,7 +1293,7 @@ void opj_dwt_calc_explicit_stepsizes(opj
         if (tccp->qntsty == J2K_CCP_QNTSTY_NOQNT) {
             stepsize = 1.0;
         } else {
-            OPJ_FLOAT64 norm = opj_dwt_norms_real[orient][level];
+            OPJ_FLOAT64 norm = opj_dwt_getnorm_real(level, orient);
             stepsize = (1 << (gain)) / norm;
         }
         opj_dwt_encode_stepsize((OPJ_INT32) floor(stepsize * 8192.0),