diff --git a/tests/playwright-test/playwright-test-fixtures.ts b/tests/playwright-test/playwright-test-fixtures.ts
index 11a2994ad2..632e09ca9f 100644
--- a/tests/playwright-test/playwright-test-fixtures.ts
+++ b/tests/playwright-test/playwright-test-fixtures.ts
@@ -222,6 +222,7 @@ export function cleanEnv(env: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
     GITHUB_RUN_ID: undefined,
     GITHUB_SERVER_URL: undefined,
     GITHUB_SHA: undefined,
+    GITHUB_BASE_REF: undefined,
     // END: Reserved CI
     PW_TEST_HTML_REPORT_OPEN: undefined,
     PLAYWRIGHT_HTML_OPEN: undefined,