diff --git a/tools/releasetools/sign_target_files_apks b/tools/releasetools/sign_target_files_apks
index 5398cec..0ecb906 100755
--- a/tools/releasetools/sign_target_files_apks
+++ b/tools/releasetools/sign_target_files_apks
@@ -142,6 +142,7 @@
 
 def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
                        apk_key_map, key_passwords):
+
   maxsize = max([len(os.path.basename(i.filename))
                  for i in input_tf_zip.infolist()
                  if i.filename.endswith('.apk')])
@@ -188,7 +189,7 @@
     elif info.filename in ("SYSTEM/build.prop",
                            "RECOVERY/RAMDISK/default.prop"):
       print "rewriting %s:" % (info.filename,)
-      new_data = RewriteProps(data)
+      new_data = RewriteProps(data, misc_info)
       output_tf_zip.writestr(out_info, new_data)
       if info.filename == "RECOVERY/RAMDISK/default.prop":
         write_to_temp(info.filename, info.external_attr, new_data)
@@ -270,14 +271,20 @@
   return ",".join(sorted(tags))
 
 
-def RewriteProps(data):
+def RewriteProps(data, misc_info):
   output = []
   for line in data.split("\n"):
     line = line.strip()
     original_line = line
-    if line and line[0] != '#':
+    if line and line[0] != '#' and "=" in line:
       key, value = line.split("=", 1)
-      if key == "ro.build.fingerprint":
+      if (key == "ro.build.fingerprint"
+          and misc_info.get("oem_fingerprint_properties") is None):
+        pieces = value.split("/")
+        pieces[-1] = EditTags(pieces[-1])
+        value = "/".join(pieces)
+      elif (key == "ro.build.thumbprint"
+          and misc_info.get("oem_fingerprint_properties") is not None):
         pieces = value.split("/")
         pieces[-1] = EditTags(pieces[-1])
         value = "/".join(pieces)
@@ -291,7 +298,7 @@
       elif key == "ro.build.display.id":
         # change, eg, "JWR66N dev-keys" to "JWR66N"
         value = value.split()
-        if len(value) >  1 and value[-1].endswith("-keys"):
+        if len(value) > 1 and value[-1].endswith("-keys"):
           value.pop()
         value = " ".join(value)
       line = key + "=" + value