diff --git a/mkbootimg/bootimg.h b/mkbootimg/bootimg.h
index 2bd8230..5ab6195 100644
--- a/mkbootimg/bootimg.h
+++ b/mkbootimg/bootimg.h
@@ -43,11 +43,7 @@
 
     uint32_t tags_addr;    /* physical addr for kernel tags */
     uint32_t page_size;    /* flash page size we assume */
-
-    /* operating system version; "1.2.34" -> 010234 */
-    uint32_t os_version;
-    /* operating system patch level; "2016-01-01" -> 20160101 */
-    uint32_t os_patch_level;
+    uint32_t unused[2];    /* future expansion: should be 0 */
 
     uint8_t name[BOOT_NAME_SIZE]; /* asciiz product name */
 
diff --git a/mkbootimg/mkbootimg b/mkbootimg/mkbootimg
index be342c9..f95d703 100755
--- a/mkbootimg/mkbootimg
+++ b/mkbootimg/mkbootimg
@@ -20,7 +20,6 @@
 from struct import pack
 from hashlib import sha1
 import sys
-import re
 
 def filesize(f):
     if f is None:
@@ -48,7 +47,7 @@
 def write_header(args):
     BOOT_MAGIC = 'ANDROID!'.encode()
     args.output.write(pack('8s', BOOT_MAGIC))
-    args.output.write(pack('10I',
+    args.output.write(pack('8I',
         filesize(args.kernel),                          # size in bytes
         args.base + args.kernel_offset,                 # physical load addr
         filesize(args.ramdisk),                         # size in bytes
@@ -56,9 +55,8 @@
         filesize(args.second),                          # size in bytes
         args.base + args.second_offset,                 # physical load addr
         args.base + args.tags_offset,                   # physical addr for kernel tags
-        args.pagesize,                                  # flash page size we assume
-        args.os_version,                                # operating system version
-        args.os_patch_level))                           # security patch level
+        args.pagesize))                                 # flash page size we assume
+    args.output.write(pack('8x'))                       # future expansion: should be 0
     args.output.write(pack('16s', args.board.encode())) # asciiz product name
     args.output.write(pack('512s', args.cmdline[:512].encode()))
 
@@ -99,18 +97,6 @@
 def parse_int(x):
     return int(x, 0)
 
-def match_to_int(x):
-    if (x and x.lastindex == 3):
-        return (parse_int(x.group(3)) +
-                parse_int(x.group(2)) * 100 +
-                parse_int(x.group(1)) * 10000)
-    return 0
-
-def parse_os_version(x):
-    return match_to_int(re.search(r'^(\d+)\.(\d{1,2})\.(\d{1,2})', x))
-
-def parse_os_patch_level(x):
-    return match_to_int(re.search(r'^(\d{4,})-(\d{2})-(\d{2})', x))
 
 def parse_cmdline():
     parser = ArgumentParser()
@@ -125,10 +111,6 @@
     parser.add_argument('--ramdisk_offset', help='ramdisk offset', type=parse_int, default=0x01000000)
     parser.add_argument('--second_offset', help='2nd bootloader offset', type=parse_int,
                         default=0x00f00000)
-    parser.add_argument('--os_version', help='operating system version', type=parse_os_version,
-                        default=0)
-    parser.add_argument('--os_patch_level', help='operating system patch level',
-                        type=parse_os_patch_level, default=0)
     parser.add_argument('--tags_offset', help='tags offset', type=parse_int, default=0x00000100)
     parser.add_argument('--board', help='board name', default='', action=ValidateStrLenAction,
                         maxlen=16)