diff --git a/lib/HTS_engine.c b/lib/HTS_engine.c
old mode 100644
new mode 100755
index 5325426..b507226
--- a/lib/HTS_engine.c
+++ b/lib/HTS_engine.c
@@ -733,6 +733,9 @@ void HTS_Engine_save_riff(HTS_Engine * engine, FILE * fp)
    HTS_fwrite_little_endian(data_37_40, sizeof(char), 4, fp);
    HTS_fwrite_little_endian(&data_41_44, sizeof(int), 1, fp);
    /* write data */
+   
+   short peak = 0;
+   
    for (i = 0; i < HTS_GStreamSet_get_total_nsamples(gss); i++) {
       x = HTS_GStreamSet_get_speech(gss, i);
       if (x > 32767.0)
@@ -741,6 +744,14 @@ void HTS_Engine_save_riff(HTS_Engine * engine, FILE * fp)
          temp = -32768;
       else
          temp = (short) x;
+      short sample = abs(temp);
+      if(peak < sample)
+         peak = sample;
+   }
+   float mul = (32767.0f / peak);
+   for (i = 0; i < HTS_GStreamSet_get_total_nsamples(gss); i++) {
+      x = HTS_GStreamSet_get_speech(gss, i);
+      temp = ((short) x) * mul;
       HTS_fwrite_little_endian(&temp, sizeof(short), 1, fp);
    }
 }