diff --git a/testing/tools/test_runner.py b/testing/tools/test_runner.py
index 2c61745..b1b1986 100644
--- a/testing/tools/test_runner.py
+++ b/testing/tools/test_runner.py
@@ -10,7 +10,6 @@
 from dataclasses import dataclass
 import multiprocessing
 import os
-import platform
 import re
 import shutil
 import subprocess
@@ -433,11 +432,6 @@
     if self.resultdb:
       print('Detected ResultSink environment')
 
-      # TODO(crbug.com/pdfium/1921): Fix performance on Windows.
-      if platform.system() == 'Windows':
-        self.resultdb = None
-        print('Disabled ResultDB support due to https://crbug.com/pdfium/1921')
-
     # Collect test cases.
     walk_from_dir = finder.TestingDir(relative_test_dir)