diff --git a/libc/tools/generate_notice.py b/libc/tools/generate_notice.py
index c998e32..034a3b3 100755
--- a/libc/tools/generate_notice.py
+++ b/libc/tools/generate_notice.py
@@ -151,6 +151,12 @@
              (path, len(lines)))
         return
 
+    # Skip over our own files if they're SPDX licensed.
+    # Because we use the // comment style, without this we'd copy the whole source file!
+    if re.compile('^// Copyright \(C\) 2\d\d\d The Android Open Source Project\n' + \
+                  '// SPDX-License-Identifier: ').match(content):
+        return
+
     # Manually iterate because extract_copyright_at tells us how many lines to
     # skip.
     i = 0