diff --git a/extensions/browser/tsconfig.json b/extensions/browser/tsconfig.json
index b8a85a99ac3..48919f03f0b 100644
--- a/extensions/browser/tsconfig.json
+++ b/extensions/browser/tsconfig.json
@@ -9,6 +9,7 @@
     "./dist/**",
     "./node_modules/**",
     "./src/test-support/**",
+    "./src/**/test-support/**",
     "./src/**/*test-helpers.ts",
     "./src/**/*test-harness.ts",
     "./src/**/*test-support.ts"
diff --git a/tsconfig.extensions.json b/tsconfig.extensions.json
index 7373b980906..ab5d5688372 100644
--- a/tsconfig.extensions.json
+++ b/tsconfig.extensions.json
@@ -14,6 +14,7 @@
     "**/*test-harness.ts",
     "**/*test-support.ts",
     "extensions/**/src/test-support/**",
+    "extensions/**/src/**/test-support/**",
     "test/**"
   ]
 }