diff --git a/lib_rend/ivas_dirac_rend_fx.c b/lib_rend/ivas_dirac_rend_fx.c
index 03831e4076387cfbb36d37ab35039e708748a5cd..2f748289a013084c8006a5f453e78ff522e6da9a 100644
--- a/lib_rend/ivas_dirac_rend_fx.c
+++ b/lib_rend/ivas_dirac_rend_fx.c
@@ -4166,7 +4166,7 @@ static void ivas_masa_ext_dirac_render_sf_fx(
                 hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx[i] = L_add( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx[i], surCohEner_fx ); // q29
                 move32();
 
-                surCohRatio_fx[i] = L_deposit_h( BASOP_Util_Divide3232_Scale( surCohEner_fx, L_add( L_add( 1, dirEne_fx ), surCohEner_fx ), &surCohRatio_exp[i] ) ); // 31-surCohRatio_exp
+                surCohRatio_fx[i] = BASOP_Util_Divide3232_Scale_newton( surCohEner_fx, L_add( L_add( 1, dirEne_fx ), surCohEner_fx ), &surCohRatio_exp[i] ); // 31-surCohRatio_exp
                 move32();
                 temp_exp = s_max( temp_exp, surCohRatio_exp[i] );
             }
@@ -4961,7 +4961,7 @@ static void ivas_masa_ext_dirac_render_sf_fx(
                                                                       hSpatParamRendCom->num_freq_bands ) );
             }
         }
-        scale_factor = sub( scale_factor, 3 ); // guard bits
+        scale_factor = sub( scale_factor, find_guarded_bits_fx( hSpatParamRendCom->num_freq_bands ) ); // guard bits
 
         FOR( ch = 0; ch < hDirACRend->num_outputs_dir; ch++ )
         {