diff --git a/lib_dec/ivas_dirac_dec.c b/lib_dec/ivas_dirac_dec.c
index 2d84e7604b3c3039f867316da6c2aa557b3cbe2a..2d68fe7869c02ff4f3f7d1a28d47894c3cace900 100644
--- a/lib_dec/ivas_dirac_dec.c
+++ b/lib_dec/ivas_dirac_dec.c
@@ -4591,7 +4591,7 @@ void ivas_dirac_dec_render_sf_fx(
         test();
         IF( L_and( h_dirac_output_synthesis_params->use_onset_filters, L_and( NE_16( hDirAC->hConfig->dec_param_estim, TRUE ), NE_16( hDirACRend->synthesisConf, DIRAC_SYNTHESIS_GAIN_SHD ) ) ) )
         {
-            Scale_sig32( h_dirac_output_synthesis_state->diffuse_power_factor_fx, h_dirac_output_synthesis_params->max_band_decorr, sub( Q31, h_dirac_output_synthesis_state->diffuse_power_factor_q ) );
+            Scale_sig32( h_dirac_output_synthesis_state->diffuse_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, h_dirac_output_synthesis_state->diffuse_power_factor_q ) );
             h_dirac_output_synthesis_state->diffuse_power_factor_q = Q31;
             move16();
 
@@ -4603,11 +4603,11 @@ void ivas_dirac_dec_render_sf_fx(
         test();
         IF( L_and( EQ_16( hDirAC->hConfig->dec_param_estim, TRUE ), NE_16( hDirACRend->synthesisConf, DIRAC_SYNTHESIS_GAIN_SHD ) ) )
         {
-            scale_sig32( h_dirac_output_synthesis_state->direct_power_factor_fx, hSpatParamRendCom->num_freq_bands, sub( Q31, h_dirac_output_synthesis_state->direct_power_factor_q ) );
+            scale_sig32( h_dirac_output_synthesis_state->direct_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, h_dirac_output_synthesis_state->direct_power_factor_q ) );
             h_dirac_output_synthesis_state->direct_power_factor_q = Q31;
             move16();
 
-            scale_sig32( h_dirac_output_synthesis_state->diffuse_power_factor_fx, hSpatParamRendCom->num_freq_bands, sub( Q31, h_dirac_output_synthesis_state->diffuse_power_factor_q ) );
+            scale_sig32( h_dirac_output_synthesis_state->diffuse_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, h_dirac_output_synthesis_state->diffuse_power_factor_q ) );
             h_dirac_output_synthesis_state->diffuse_power_factor_q = Q31;
             move16();
 
@@ -4801,7 +4801,7 @@ void ivas_dirac_dec_render_sf_fx(
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q, Q31 ) )
         {
-            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx, ( size_ho / hDirACRend->num_outputs_dir ), sub( Q31, hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q ) );
+            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q ) );
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.direct_responses_q, Q31 ) )
         {
@@ -4809,7 +4809,7 @@ void ivas_dirac_dec_render_sf_fx(
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q, Q31 ) )
         {
-            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx, hDirACRend->h_output_synthesis_psd_params.max_band_decorr, sub( Q31, hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q ) );
+            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q ) );
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.q_cy_auto_diff_smooth, Q26 ) )
         {
@@ -4884,7 +4884,7 @@ void ivas_dirac_dec_render_sf_fx(
 
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q, Q31 ) )
         {
-            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx, hSpatParamRendCom->num_freq_bands, sub( Q31, hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q ) );
+            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q ) );
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.direct_responses_q, Q31 ) )
         {
@@ -4892,7 +4892,7 @@ void ivas_dirac_dec_render_sf_fx(
         }
         IF( NE_16( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q, Q31 ) )
         {
-            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx, hSpatParamRendCom->num_freq_bands, sub( Q31, hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q ) );
+            Scale_sig32( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx, h_dirac_output_synthesis_state->diff_dir_power_factor_len, sub( Q31, hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_q ) );
         }
         IF( NE_16( q_diffuseness_vector, Q31 ) )
         {
diff --git a/lib_rend/ivas_dirac_rend.c b/lib_rend/ivas_dirac_rend.c
index f70fec75be985195426400d5958c19dcfa87f424..a96e1cf5f9fefbe24ca6b48bc0b147722fef7559 100644
--- a/lib_rend/ivas_dirac_rend.c
+++ b/lib_rend/ivas_dirac_rend.c
@@ -1471,6 +1471,7 @@ ivas_error ivas_dirac_alloc_mem_fx(
 
     hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx = hDirAC_mem->direct_power_factor_fx;
     hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx = hDirAC_mem->diffuse_power_factor_fx;
+    hDirACRend->h_output_synthesis_psd_state.diff_dir_power_factor_len = size_pf;
     set_zero_fx( hDirACRend->h_output_synthesis_psd_state.direct_power_factor_fx, size_pf );
     set_zero_fx( hDirACRend->h_output_synthesis_psd_state.diffuse_power_factor_fx, size_pf );
     hDirACRend->h_output_synthesis_psd_state.direct_power_factor_q = Q31;
diff --git a/lib_rend/ivas_stat_rend.h b/lib_rend/ivas_stat_rend.h
index b8ac1194b19db82e8675e78180893fbe52b959ec..869fd98bd13b768813871890d665c38634b3b5ce 100644
--- a/lib_rend/ivas_stat_rend.h
+++ b/lib_rend/ivas_stat_rend.h
@@ -451,6 +451,7 @@ typedef struct dirac_output_synthesis_state_structure
 
     Word16 direct_power_factor_q;
     Word16 diffuse_power_factor_q;
+    Word16 diff_dir_power_factor_len;
 
     Word32 *proto_power_smooth_fx; /* Smoothed power of the prototype signals. Size: num_freq_bands*num_channels. */
     Word16 proto_power_smooth_q;