diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 5d92ede..b8f848f 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -271,6 +271,10 @@
 
 def IsEntryOtaPackage(input_zip, filename):
   with input_zip.open(filename, "r") as fp:
+    external_attr = input_zip.getinfo(filename).external_attr
+    if stat.S_ISLNK(external_attr >> 16):
+      return IsEntryOtaPackage(input_zip,
+          os.path.join(os.path.dirname(filename), fp.read().decode()))
     return IsOtaPackage(fp)