diff --git a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
index ca64119788ee..c950042ff0bd 100755
--- a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
+++ b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
@@ -60,6 +60,11 @@ def main():
   if len(clang_tidy_extra_args) == 0:
     clang_tidy_extra_args = ['--', '--std=c++11'] if extension == '.cpp' \
                        else ['--']
+
+  # Tests should not rely on STL being available, and instead provide mock
+  # implementations of relevant APIs.
+  clang_tidy_extra_args.append('-nostdinc++')
+
   if resource_dir is not None:
     clang_tidy_extra_args.append('-resource-dir=%s' % resource_dir)