diff --git a/tools/test-typescript/main.cpp b/tools/test-typescript/main.cpp
index 36b7361b1a..0d84eb5777 100644
--- a/tools/test-typescript/main.cpp
+++ b/tools/test-typescript/main.cpp
@@ -45,6 +45,10 @@ constexpr String8_View ignored_tests[] = {
     u8"/downlevelLetConst15.ts"sv,
     u8"/initializePropertiesWithRenamedLet.ts"sv,
 
+    // This test correctly emits E0266 (a warning).
+    // TODO(strager): Disable E0266 for this test but still check this test.
+    u8"/castOfAwait.ts"sv,
+
     // These tests correctly emit E0427 (a warning).
     // TODO(strager): Disable E0427 for all tests and don't ignore these tests.
     u8"/es5-asyncFunctionSwitchStatements.ts"_sv,