diff --git a/lib_enc/ivas_init_enc.c b/lib_enc/ivas_init_enc.c
index a7b01c2cecaca0437207b7354566f97d50054367..3b0fa49d7b226148ba54ef4b9dc2871db5edf2e5 100644
--- a/lib_enc/ivas_init_enc.c
+++ b/lib_enc/ivas_init_enc.c
@@ -417,7 +417,11 @@ ivas_error ivas_init_encoder(
      *-----------------------------------------------------------------*/
 
     nchan_inp_buff = hEncoderConfig->nchan_inp;
-    if ( ivas_format == MASA_ISM_FORMAT )
+    if ( ivas_format == MONO_FORMAT )
+    {
+        nchan_inp_buff = 0;
+    }
+    else if ( ivas_format == MASA_ISM_FORMAT )
     {
         if ( hEncoderConfig->nchan_inp - hEncoderConfig->nchan_ism == 1 ) /* mono is duplicated in monoMASA */
         {
diff --git a/lib_rend/ivas_output_init.c b/lib_rend/ivas_output_init.c
index 990d36c8f04ac1a729f65848c72d612fc47a6bc9..36888cc72df8f4fba72b20c0d765683bd32d0583 100644
--- a/lib_rend/ivas_output_init.c
+++ b/lib_rend/ivas_output_init.c
@@ -274,7 +274,11 @@ int16_t ivas_get_nchan_buffers_dec(
 
     nchan_out_buff = MAX_OUTPUT_CHANNELS;
 
-    if ( st_ivas->ivas_format == STEREO_FORMAT )
+    if ( st_ivas->ivas_format == MONO_FORMAT )
+    {
+        nchan_out_buff = 0;
+    }
+    else if ( st_ivas->ivas_format == STEREO_FORMAT )
     {
         nchan_out_buff = max( st_ivas->hDecoderConfig->nchan_out, CPE_CHANNELS );
     }