diff --git a/lib_com/options.h b/lib_com/options.h
index c1a3f4433c4fd9f0258294f5a5a8fb527cbec87c..c1580c1cb5d1fa49922d33acecdea369d18e1123 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -189,6 +189,7 @@
 
 //#define FIX_777_COMBI_RENDER_CONFIG_FILE                /* Philips: Fix for combined renderer config file support */
 /* #define NONBE_FIX_991_PARAMBIN_BINARY_HRTF */             /* Nokia: issue #991: fix using of binary file HRTF in ParamBin (to actiate when USE_NEW_HRTF_BINARY_FILE_FORMAT and FIX_777_COMBI_RENDER_CONFIG_FILE are on  )*/
+#define FIX_1024_REMOVE_PARAMMC_MIXING_MAT              /* VA: issue 1024: remove unused function ivas_param_mc_get_mono_stereo_mixing_matrices() */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_mc_param_dec.c b/lib_dec/ivas_mc_param_dec.c
index 22ad5e34b45abf1b6be93158412bd92d565dcb09..5405fbba6048dfb87f543b76e7f2626ac0c0d1bf 100644
--- a/lib_dec/ivas_mc_param_dec.c
+++ b/lib_dec/ivas_mc_param_dec.c
@@ -88,8 +88,10 @@ static void ivas_param_mc_dequantize_cov( PARAM_MC_DEC_HANDLE hDirAC, float *ild
 
 static void ivas_param_mc_get_mixing_matrices( PARAM_MC_DEC_HANDLE hParamMC, IVAS_OUTPUT_SETUP *hSynthesisOutputSetup, float Cx_in[PARAM_MC_MAX_TRANSPORT_CHANS * PARAM_MC_MAX_TRANSPORT_CHANS], const int16_t param_band_idx, float *mixing_matrix[], float *mixing_matrix_res[], const int16_t nY_int, const PARAM_MC_SYNTHESIS_CONF synth_conf, const int16_t nX, const int16_t nY );
 
+#ifndef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
 static void ivas_param_mc_get_mono_stereo_mixing_matrices( PARAM_MC_DEC_HANDLE hParamMC, float Cx_in[PARAM_MC_MAX_TRANSPORT_CHANS * PARAM_MC_MAX_TRANSPORT_CHANS], const int16_t param_band_idx, float *mixing_matrix[], float *mixing_matrix_res[], const int16_t nY_intern, const int16_t nX, const int16_t nY_cov );
 
+#endif
 static void param_mc_update_mixing_matrices( PARAM_MC_DEC_HANDLE hParamMC, float *mixing_matrix[], float *mixing_matrix_res[], const uint16_t nX, const uint16_t nY );
 
 static void ivas_param_mc_dec_compute_interpolator( const uint16_t bAttackPresent, const uint16_t attackPos, const uint16_t interp_length, float *interpolator );
@@ -1494,6 +1496,7 @@ void ivas_param_mc_dec_digest_tc(
                 continue;
             }
 
+#ifndef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
             if ( hParamMC->synthesis_conf == PARAM_MC_SYNTH_MONO_STEREO )
             {
                 ivas_param_mc_get_mono_stereo_mixing_matrices( hParamMC,
@@ -1507,6 +1510,7 @@ void ivas_param_mc_dec_digest_tc(
             }
             else
             {
+#endif
                 /* generate mixing matrices */
                 ivas_param_mc_get_mixing_matrices( hParamMC,
                                                    hSynthesisOutputSetup,
@@ -1518,7 +1522,9 @@ void ivas_param_mc_dec_digest_tc(
                                                    hParamMC->synthesis_conf,
                                                    nchan_transport,
                                                    nchan_out_cov );
+#ifndef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
             }
+#endif
         }
     }
 
@@ -2488,6 +2494,7 @@ static void ivas_param_mc_get_mixing_matrices(
 }
 
 
+#ifndef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
 /*-------------------------------------------------------------------------
  * ivas_param_mc_get_mono_stereo_mixing_matrices()
  *
@@ -2607,6 +2614,7 @@ static void ivas_param_mc_get_mono_stereo_mixing_matrices(
     return;
 }
 
+#endif
 
 /*-------------------------------------------------------------------------
  * param_mc_update_mixing_matrices()
diff --git a/lib_dec/ivas_out_setup_conversion.c b/lib_dec/ivas_out_setup_conversion.c
index fd0ebfb3613c97f5408a7cfbd4ccd0fb79f3cd92..d192a2013820787e2dd154ee4f7d1fb48677e4dc 100644
--- a/lib_dec/ivas_out_setup_conversion.c
+++ b/lib_dec/ivas_out_setup_conversion.c
@@ -973,7 +973,11 @@ void ivas_ls_setup_conversion_process_mdct_param_mc(
         set_zero( Nrqq, MAX_OUTPUT_CHANNELS );
         set_zero( target_ch_ener, MAX_OUTPUT_CHANNELS );
 
+#ifdef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
+        /* Step 1.2, get target channel energies for the transported format, Nrqq calculation */
+#else
         /* Step 1.2, get target channel energies for the transported format as in ivas_param_mc_get_mono_stereo_mixing_matrices(), Nrqq calculation */
+#endif
         ild_q = hParamMC->icld_q + bandIdx * hParamMC->hMetadataPMC->ild_mapping_conf->ild_map_size_lfe;
 
         for ( chInIdx = 0; chInIdx < nchan_transport_format; chInIdx++ )
@@ -991,7 +995,11 @@ void ivas_ls_setup_conversion_process_mdct_param_mc(
             Nrqq[hParamMC->hMetadataPMC->ild_mapping_conf->ild_index[chInIdx]] = powf( 10.0f, ild_q[chInIdx] / 10.0f ) * hParamMC->hMetadataPMC->ild_factors[chInIdx] * ref_ener;
         }
 
+#ifdef FIX_1024_REMOVE_PARAMMC_MIXING_MAT
+        /* Step 1.3 get target Cy (with dmx matrix from CICPX to MONO/STEREO saved in hParamMC) */
+#else
         /* Step 1.3 get target Cy like in ivas_param_mc_get_mono_stereo_mixing_matrices() (with dmx matrix from CICPX to MONO/STEREO saved in hParamMC) */
+#endif
         for ( chOutIdx = 0; chOutIdx < nchan_out; chOutIdx++ )
         {
             for ( i = 0; i < nchan_transport_format; i++ )