diff --git a/lib_dec/ivas_binRenderer_internal.c b/lib_dec/ivas_binRenderer_internal.c
index 5bd09236e0e40471c499b7d55495a096578e0c4f..b3c31a97942b309447665690a9b31b9829d58b5d 100644
--- a/lib_dec/ivas_binRenderer_internal.c
+++ b/lib_dec/ivas_binRenderer_internal.c
@@ -723,7 +723,11 @@ ivas_error ivas_binRenderer_open(
     }
 
     /* Allocate memories needed for reverb module */
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+    if ( st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV && st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
     if ( st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM && st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#endif
     {
         if ( ( error = ivas_binaural_reverb_open( &( hBinRenderer->hReverb ),
                                                   hBinRenderer->conv_band,
@@ -731,7 +735,11 @@ ivas_error ivas_binRenderer_open(
                                                   &( st_ivas->hRenderConfig->roomAcoustics ),
                                                   st_ivas->hIntSetup.output_config,
                                                   st_ivas->hDecoderConfig->output_Fs,
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                                                  RENDERER_BINAURAL_FASTCONV,
+#else
                                                   RENDERER_BINAURAL_FASTCONV_ROOM,
+#endif
                                                   st_ivas->hHrtfFastConv,
                                                   st_ivas->hHrtfParambin ) ) != IVAS_ERR_OK )
         {
diff --git a/lib_dec/ivas_output_config.c b/lib_dec/ivas_output_config.c
index e60a48a10c839f4b958436bb310eb6e764513d31..94e22ea419186ad6fbd932081aa4ab8fdbc279a0 100644
--- a/lib_dec/ivas_output_config.c
+++ b/lib_dec/ivas_output_config.c
@@ -82,7 +82,11 @@ void ivas_renderer_select(
         {
             if ( st_ivas->ism_mode == ISM_MODE_PARAM )
             {
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( output_config == AUDIO_CONFIG_BINAURAL )
+#else
                 if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#endif
                 {
                     *renderer_type = RENDERER_BINAURAL_PARAMETRIC;
                 }
@@ -147,7 +151,11 @@ void ivas_renderer_select(
         else if ( st_ivas->ivas_format == SBA_FORMAT )
         {
             *internal_config = AUDIO_CONFIG_HOA3;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+            if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
             if ( output_config == AUDIO_CONFIG_BINAURAL )
+#endif
             {
                 *renderer_type = RENDERER_BINAURAL_FASTCONV;
             }
@@ -195,7 +203,11 @@ void ivas_renderer_select(
             else
             {
                 *internal_config = transport_config;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
                 if ( output_config == AUDIO_CONFIG_BINAURAL )
+#endif
                 {
 #ifdef DEBUGGING
                     if ( ( ( ( st_ivas->transport_config == AUDIO_CONFIG_5_1 || st_ivas->transport_config == AUDIO_CONFIG_7_1 ) && ( st_ivas->hDecoderConfig->Opt_Headrotation || st_ivas->hDecoderConfig->Opt_ExternalOrientation ) ) || ( st_ivas->hDecoderConfig->force_rend == FORCE_TD_RENDERER ) ) && ( st_ivas->mc_mode == MC_MODE_MCT || st_ivas->mc_mode == MC_MODE_PARAMUPMIX ) && !( st_ivas->hDecoderConfig->force_rend == FORCE_CLDFB_RENDERER ) )
diff --git a/lib_rend/ivas_reverb.c b/lib_rend/ivas_reverb.c
index 6374b6812e98f6d53829eb3a6566dcfaf28c14e9..cfea5594a1b4e9074ee715ff2f605a21ce15c258 100644
--- a/lib_rend/ivas_reverb.c
+++ b/lib_rend/ivas_reverb.c
@@ -1813,7 +1813,11 @@ ivas_error ivas_binaural_reverb_open(
         set_f( hReverb->preDelayBufferImag[k], 0.0f, hReverb->numBins );
     }
 
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+    if ( renderer_type == RENDERER_BINAURAL_FASTCONV )
+#else
     if ( renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM )
+#endif
     {
         if ( !roomAcoustics->override )
         {
@@ -1900,7 +1904,11 @@ ivas_error ivas_binaural_reverb_open(
     }
     else
     {
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+        if (renderer_type == RENDERER_BINAURAL_FASTCONV )
+#else
         if ( renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM )
+#endif
         {
             ivas_binaural_reverb_setReverbTimes( hReverb, sampling_rate, hHrtfFastConv->fastconvReverberationTimes, hHrtfFastConv->fastconvReverberationEneCorrections );
             ivas_binaural_reverb_setPreDelay( hReverb, 10 );