diff --git a/tools/wpt/browser.py b/tools/wpt/browser.py
index 8deec90b5ccbbba..181bd37a9e222c5 100644
--- a/tools/wpt/browser.py
+++ b/tools/wpt/browser.py
@@ -551,7 +551,7 @@ def _build_snapshots_url(self, revision, filename):
         return ("https://storage.googleapis.com/chromium-browser-snapshots/"
                 f"{self._chromium_platform_string}/{revision}/{filename}")
 
-    def _get_pinned_chromium_revision(self) -> str:
+    def _get_pinned_chromium_revision(self):
         """Returns the pinned Chromium revision number."""
         try:
             # File used to check the validity of new Chromium revisions.
@@ -561,7 +561,7 @@ def _get_pinned_chromium_revision(self) -> str:
             with open(filepath) as f:
                 return f.read().strip()
         except FileNotFoundError:
-            revision: str = get("https://storage.googleapis.com/wpt-versions/pinned_chromium_revision").text.strip()
+            revision = get("https://storage.googleapis.com/wpt-versions/pinned_chromium_revision").text.strip()
             return revision
 
     def _get_chromium_revision(self, filename=None, version=None):
diff --git a/tools/wpt/check_chromium_revision.py b/tools/wpt/check_chromium_revision.py
index ba0f3018a02c58a..543394f908bca21 100644
--- a/tools/wpt/check_chromium_revision.py
+++ b/tools/wpt/check_chromium_revision.py
@@ -16,4 +16,4 @@ def check_chromium_revision() -> None:
 
 
 if __name__ == "__main__":
-    check_chromium_revision()  # type: ignore
+    check_chromium_revision()