diff --git a/vendor_snapshot/update.py b/vendor_snapshot/update.py
index 8f320e937..b3fddf4b5 100644
--- a/vendor_snapshot/update.py
+++ b/vendor_snapshot/update.py
@@ -512,7 +512,8 @@ def get_ninja_inputs(ninja_binary, ninja_build_file, modules):
     return inputs
 
 
-def check_module_usage(install_dir, ninja_binary, ninja_file, goals, output):
+def check_module_usage(install_dir, ninja_binary, image, ninja_file, goals,
+                       output):
     all_installed_files = find_all_installed_files(install_dir)
     all_props_files = find_all_props_files(install_dir)
 
@@ -555,14 +556,14 @@ def check_module_usage(install_dir, ninja_binary, ninja_file, goals, output):
     for f, i in sorted(used_file_to_info.items()):
         logging.debug('{} {}'.format(f, i))
         for m in i:
-            key = 'n=%s,v=%s,a=%s,c=%s,h=%s' % m
             (name, variation, arch, is_cfi, is_header) = m
             if not is_header:
-                used_modules.add(key)
+                used_modules.add(name)
 
     with open(output, 'w') as f:
+        f.write('%s_SNAPSHOT_MODULES := \\\n' % image.upper())
         for m in sorted(used_modules):
-            f.write('%s\n' % m)
+            f.write('  %s \\\n' % m)
 
 def check_call(cmd):
     logging.debug('Running `{}`'.format(' '.join(cmd)))
@@ -738,7 +739,7 @@ def main():
             raise ValueError(
                 'Please provide --check-module-usage-output option.')
 
-        check_module_usage(install_dir, ninja_binary,
+        check_module_usage(install_dir, ninja_binary, args.image,
                            args.check_module_usage_ninja_file,
                            args.check_module_usage_goal,
                            args.check_module_usage_output)