diff --git a/lib_dec/ivas_ism_dec.c b/lib_dec/ivas_ism_dec.c
index c031ec8c4bd36f36f7cd001f840f9ebfaeffa7ff..cae5ebaf4d76f7c3e7ff1875bc2b0f7c6fade2a4 100644
--- a/lib_dec/ivas_ism_dec.c
+++ b/lib_dec/ivas_ism_dec.c
@@ -184,6 +184,15 @@ static ivas_error ivas_ism_bitrate_switching(
                 {
                     return error;
                 }
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+                {
+                    if ( ( error = ivas_reverb_open( &st_ivas->hReverb, st_ivas->hDecoderConfig->output_config, NULL, st_ivas->hRenderConfig, st_ivas->hDecoderConfig->output_Fs ) ) != IVAS_ERR_OK )
+                    {
+                        return error;
+                    }
+                }
+#endif
             }
         }
         else
@@ -258,6 +267,14 @@ static ivas_error ivas_ism_bitrate_switching(
                 {
                     st_ivas->hHrtfTD = NULL;
                 }
+
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if (st_ivas->hOutSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB)
+                {
+                    ivas_reverb_close( &st_ivas->hReverb );
+                }
+
+#endif
             }
         }
         else