diff --git a/xorriso/opts_p_z.c b/xorriso/opts_p_z.c
index 59fd3ad7..9ba7d73b 100644
--- a/xorriso/opts_p_z.c
+++ b/xorriso/opts_p_z.c
@@ -245,6 +245,7 @@ int Xorriso_option_print(struct XorrisO *xorriso, char *text, int flag)
 
 /* Option -print_size
    @param flag bit0= report in mkisofs compatible form on real stdout
+                     (resp. on result channel if xorriso->packet_output)
 */
 int Xorriso_option_print_size(struct XorrisO *xorriso, int flag)
 {
@@ -253,8 +254,10 @@ int Xorriso_option_print_size(struct XorrisO *xorriso, int flag)
  if(!xorriso->volset_change_pending) {
    sprintf(xorriso->info_text,"-print_size: No image modifications pending");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "WARNING", 0);
-   sprintf(xorriso->result_line,"Image size   : 0s\n");
-   Xorriso_result(xorriso,0);
+   if(!(flag & 1)) {
+     sprintf(xorriso->result_line,"Image size   : 0s\n");
+     Xorriso_result(xorriso,0);
+   }
    return(2);
  }
  ret= Xorriso_write_session(xorriso, 1);
@@ -265,12 +268,16 @@ int Xorriso_option_print_size(struct XorrisO *xorriso, int flag)
  }
  if(flag&1) {
    sprintf(xorriso->result_line,"%d\n", ret);
-   fd= xorriso->dev_fd_1;
-   if(fd<0)
-     fd= 1;
-   ret= write(fd, xorriso->result_line, strlen(xorriso->result_line));
-   /* (result of write intentionally ignored) */
-   fsync(fd);
+   if(xorriso->packet_output) {
+     Xorriso_result(xorriso,0);
+   } else {
+     fd= xorriso->dev_fd_1;
+     if(fd<0)
+       fd= 1;
+     ret= write(fd, xorriso->result_line, strlen(xorriso->result_line));
+     /* (result of write intentionally ignored) */
+     fsync(fd);
+   }
  } else {
    sprintf(xorriso->result_line,"Image size   : %ds\n", ret);
    Xorriso_result(xorriso,0);
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index fb54255a..0efefdd1 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2010.11.30.104719"
+#define Xorriso_timestamP "2010.11.30.112050"