diff --git a/testing/web-platform/tests/tools/manifest/download.py b/testing/web-platform/tests/tools/manifest/download.py
index 88d478fe0ef2c..0cfbf4934273c 100644
--- a/testing/web-platform/tests/tools/manifest/download.py
+++ b/testing/web-platform/tests/tools/manifest/download.py
@@ -158,7 +158,7 @@ def download_manifest(
             fileobj = io.BytesIO(resp.read())
             try:
                 with gzip.GzipFile(fileobj=fileobj) as gzf:
-                    data = read_gzf(gzf)  # type: ignore
+                    data = gzf.read()
                     decompressed = data
             except IOError:
                 logger.warning("Failed to decompress downloaded file")
@@ -180,12 +180,6 @@ def download_manifest(
     return True
 
 
-def read_gzf(gzf):  # type: ignore
-    # This is working around a mypy problem in Python 2:
-    # "Call to untyped function "read" in typed context"
-    return gzf.read()
-
-
 def create_parser():
     # type: () -> argparse.ArgumentParser
     parser = argparse.ArgumentParser()