--- cdrkit/genisoimage/write.c
+++ cdrkit/genisoimage/write.c
@@ -2061,6 +2061,11 @@ vers_write(FILE *outfile)
 
 	/* Now write the version descriptor. */
 	memset(vers, 0, sizeof (vers));
+
+	/* Per default: keep privacy. Blackout the version and arguments. */
+	if (!getenv("ISODEBUG"))
+		goto write_vers;
+
 	strcpy(vers, "MKI ");
 
 	cp = vers;
@@ -2090,14 +2095,11 @@ vers_write(FILE *outfile)
 	}
 
 	cp[SECTOR_SIZE - 1] = '\0';
- 	/* Per default: keep privacy. Blackout the version and arguments. */
-	if(getenv("ISODEBUG")) {
-		jtwrite(vers, SECTOR_SIZE, 1, 0, TRUE);
-		xfwrite(vers, SECTOR_SIZE, 1, outfile, 0, TRUE);
-	} else {
-		jtwrite(calloc(SECTOR_SIZE, 1), SECTOR_SIZE, 1, 0, TRUE);
-		xfwrite(calloc(SECTOR_SIZE, 1), SECTOR_SIZE, 1, outfile, 0, TRUE);
-	}
+
+write_vers:
+	jtwrite(vers, SECTOR_SIZE, 1, 0, TRUE);
+	xfwrite(vers, SECTOR_SIZE, 1, outfile, 0, TRUE);
+
     last_extent_written += 1;
 	return (0);
 }