diff --git a/lib_enc/ivas_core_pre_proc_front.c b/lib_enc/ivas_core_pre_proc_front.c
index 0c31acdf19f510cbe18360ac4e46d9af6cd9d5aa..79003e2974ddd75406a280fbde8991e85da03be3 100644
--- a/lib_enc/ivas_core_pre_proc_front.c
+++ b/lib_enc/ivas_core_pre_proc_front.c
@@ -229,10 +229,7 @@ ivas_error pre_proc_front_ivas(
 #ifdef DEBUG_MODE_INFO
     {
         int16_t tmp_dmx_in[L_FRAME48k];
-        for ( int16_t isample = 0; isample < input_frame; isample++ )
-        {
-            tmp_dmx_in[isample] = (int16_t) signal_in[isample - NS2SA( st->input_Fs, ACELP_LOOK_NS )];
-        }
+        mvr2s( signal_in - NS2SA( st->input_Fs, ACELP_LOOK_NS ), tmp_dmx_in, input_frame );
         dbgwrite( tmp_dmx_in, sizeof( int16_t ), input_frame, 1, strcat( fname( debug_dir, "ivas_input_dmx", 0, ch_idx + 1, ENC ), ".pcm" ) );
     }
 #endif