diff --git a/xorriso/cmp_update.c b/xorriso/cmp_update.c
index 95448689..b7902cf2 100644
--- a/xorriso/cmp_update.c
+++ b/xorriso/cmp_update.c
@@ -54,9 +54,13 @@ int Xorriso_compare_2_contents(struct XorrisO *xorriso, char *common_adr,
  int fd1= -1, ret, r1, r2, done, wanted, i, was_error= 0, use_md5= 0;
  void *stream2= NULL;
  off_t r1count= 0, r2count= 0, diffcount= 0, first_diff= -1;
- char *respt, buf1[32*1024], buf2[32*1024], offset_text[80];
+ char *respt, *buf1= NULL, *buf2= NULL, offset_text[80];
  char disk_md5[16], iso_md5[16];
  void *ctx= NULL;
+ int buf_size= 32 * 1024;
+
+ Xorriso_alloc_meM(buf1, char, buf_size);
+ Xorriso_alloc_meM(buf2, char, buf_size);
 
  respt= xorriso->result_line;
 
@@ -108,7 +112,7 @@ cannot_address:;
  done= 0;
  while(!done) {
 
-   wanted= sizeof(buf1);
+   wanted= buf_size;
    if(r1count+offset+wanted>disk_size)
      wanted= disk_size-r1count-offset;
    if(r1count+wanted>bytes)
@@ -122,7 +126,7 @@ cannot_address:;
      r1+= ret;
    }
 
-   wanted= sizeof(buf2);
+   wanted= buf_size;
    if(r2count+wanted>iso_size)
      wanted= iso_size-r2count;
 /*
@@ -248,6 +252,8 @@ cannot_address:;
 ex:;
  if(ctx != NULL)
    Xorriso_md5_end(xorriso, &ctx, disk_md5, 0);
+ Xorriso_free_meM(buf1);
+ Xorriso_free_meM(buf2);
  return(ret);
 }
 
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index ca03aa0c..7e7044b6 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2011.05.04.151605"
+#define Xorriso_timestamP "2011.05.04.151721"