diff --git a/lib_rend/ivas_dirac_rend.c b/lib_rend/ivas_dirac_rend.c
index cc3f78a2d3b6cec34a55f52b5572bc3a80cdc91a..f70fec75be985195426400d5958c19dcfa87f424 100644
--- a/lib_rend/ivas_dirac_rend.c
+++ b/lib_rend/ivas_dirac_rend.c
@@ -4277,7 +4277,7 @@ void ivas_dirac_dec_compute_diffuse_proto_fx(
     Scale_sig32( h_dirac_output_synthesis_state->proto_diffuse_buffer_f_fx, diffuse_start, sub( old_diff_e, new_diff_e ) );
 #ifdef MSAN_FIX
     Scale_sig32( h_dirac_output_synthesis_state->proto_diffuse_buffer_f_fx + diffuse_start,
-                 sub( 2 * num_freq_bands_diff * hDirACRend->hOutSetup.nchan_out_woLFE, diffuse_start ), sub( diff_e, new_diff_e ) );
+                 i_mult( shl( num_freq_bands_diff, 1 ), hDirACRend->hOutSetup.nchan_out_woLFE ), sub( diff_e, new_diff_e ) );
 #else
     Scale_sig32( h_dirac_output_synthesis_state->proto_diffuse_buffer_f_fx + diffuse_start,
                  sub( h_dirac_output_synthesis_state->proto_diffuse_buffer_f_len, diffuse_start ), sub( diff_e, new_diff_e ) );