diff --git a/lib_com/options.h b/lib_com/options.h
index 4313724010aeaf9ee2d8792bec5160880659fedf..c31e14d5c8b6f59f97b818e23317e33661eea803 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -184,6 +184,8 @@
 #define NONBE_FIX_1058_DECODER_ERROR_WITH_REVERB_ROOM   /* FhG: issue 1058: do not initialize EFAP when IntSetup is HOA3 */
 #define NONBE_FIX_944_FEC_OMASA_1SEP_OBJ_MASA                 /* Nokia: issue 944: fix FEC error in OMASA */
 #define NONBE_FIX_949_MC_5MS_FRAMING                    /*Dlb: Issue 949: fix for 5ms framing/rendering in MC mode */
+#define NONBE_FIX_952_MC_PARAMUPMIX_5MS                       /* Dlb : issue 952 : Differences between 5ms and 20ms rendering for ParamUpmix*/
+
 /* #################### End BASOP porting switches ############################ */
 
 /* clang-format on */
diff --git a/lib_dec/ivas_mc_paramupmix_dec.c b/lib_dec/ivas_mc_paramupmix_dec.c
index e5f3fe87d18493ad27d856d013a73e66d6ae07da..318f95deddeb99af49fbdad9ce292810aedaf9ff 100644
--- a/lib_dec/ivas_mc_paramupmix_dec.c
+++ b/lib_dec/ivas_mc_paramupmix_dec.c
@@ -113,6 +113,15 @@ void ivas_mc_paramupmix_dec_read_BS(
                 hMCParamUpmix->betas[i][k] = hMCParamUpmix->beta_prev[i][k];
             }
         }
+
+#ifdef NONBE_FIX_952_MC_PARAMUPMIX_5MS
+        for ( i = 0; i < MC_PARAMUPMIX_COMBINATIONS; i++ )
+        {
+            mvr2r( hMCParamUpmix->alpha_prev[i], hMCParamUpmix->alpha_sf[i], IVAS_MAX_NUM_BANDS );
+            mvr2r( hMCParamUpmix->beta_prev[i], hMCParamUpmix->beta_sf[i], IVAS_MAX_NUM_BANDS );
+        }
+#endif
+
         hMCParamUpmix->first_frame = 1;
     }
     else /*  if (!st->bfi) */
@@ -131,6 +140,17 @@ void ivas_mc_paramupmix_dec_read_BS(
         st0->bits_frame = min( MAX_BITS_METADATA, last_bit_pos + 1 );
         st0->total_brate = st_ivas->hDecoderConfig->ivas_total_brate; /* to avoid BER detect */
 
+#ifdef NONBE_FIX_952_MC_PARAMUPMIX_5MS
+        if ( hMCParamUpmix->first_frame == 0 )
+        {
+            for ( i = 0; i < MC_PARAMUPMIX_COMBINATIONS; i++ )
+            {
+                mvr2r( hMCParamUpmix->alphas[i], hMCParamUpmix->alpha_prev[i], IVAS_MAX_NUM_BANDS );
+                mvr2r( hMCParamUpmix->betas[i], hMCParamUpmix->beta_prev[i], IVAS_MAX_NUM_BANDS );
+            }
+        }
+#endif
+
         for ( i = 0; i < MC_PARAMUPMIX_COMBINATIONS; i++ )
         {
             get_ec_data( st0, ALPHA, hMCParamUpmix->alpha_quant[i], alpha_quant, hMCParamUpmix->alphas[i] );
@@ -150,6 +170,14 @@ void ivas_mc_paramupmix_dec_read_BS(
             }
             hMCParamUpmix->first_frame = 0;
         }
+
+#ifdef NONBE_FIX_952_MC_PARAMUPMIX_5MS
+        for ( i = 0; i < MC_PARAMUPMIX_COMBINATIONS; i++ )
+        {
+            mvr2r( hMCParamUpmix->alpha_prev[i], hMCParamUpmix->alpha_sf[i], IVAS_MAX_NUM_BANDS );
+            mvr2r( hMCParamUpmix->beta_prev[i], hMCParamUpmix->beta_sf[i], IVAS_MAX_NUM_BANDS );
+        }
+#endif
     }
 
     pop_wmops();
@@ -238,13 +266,13 @@ void ivas_mc_paramupmix_dec_render(
     assert( slots_to_render == 0 );
 #endif
     {
-
+#ifndef NONBE_FIX_952_MC_PARAMUPMIX_5MS
         for ( ch = 0; ch < MC_PARAMUPMIX_COMBINATIONS; ch++ )
         {
             mvr2r( hMCParamUpmix->alpha_prev[ch], hMCParamUpmix->alpha_sf[ch], IVAS_MAX_NUM_BANDS );
             mvr2r( hMCParamUpmix->beta_prev[ch], hMCParamUpmix->beta_sf[ch], IVAS_MAX_NUM_BANDS );
         }
-
+#endif
 
         for ( subframe_idx = first_sf; subframe_idx < last_sf; subframe_idx++ )
         {
@@ -260,11 +288,13 @@ void ivas_mc_paramupmix_dec_render(
             ivas_combined_orientation_update_index( st_ivas->hCombinedOrientationData, n_samples_sf );
         }
 
+#ifndef NONBE_FIX_952_MC_PARAMUPMIX_5MS
         for ( ch = 0; ch < MC_PARAMUPMIX_COMBINATIONS; ch++ )
         {
             mvr2r( hMCParamUpmix->alphas[ch], hMCParamUpmix->alpha_prev[ch], IVAS_MAX_NUM_BANDS );
             mvr2r( hMCParamUpmix->betas[ch], hMCParamUpmix->beta_prev[ch], IVAS_MAX_NUM_BANDS );
         }
+#endif
     }
 
     *nSamplesAvailable = ( st_ivas->hTcBuffer->num_slots - st_ivas->hTcBuffer->slots_rendered ) * slot_size;