--- a/flutter/build/git_revision.py
+++ b/flutter/build/git_revision.py
@@ -22,18 +22,7 @@
   if not os.path.exists(repository):
     raise IOError('path does not exist')
 
-  git = 'git'
-  if is_windows():
-    git = 'git.bat'
-  version = subprocess.check_output([
-      git,
-      '-C',
-      repository,
-      'rev-parse',
-      'HEAD',
-  ])
-
-  return str(version.strip(), 'utf-8')
+  return '0' * 41
 
 
 def main():