diff --git a/test/test.js b/test/test.js
index 2a9b18c05c1..701fdf2ec76 100644
--- a/test/test.js
+++ b/test/test.js
@@ -3428,6 +3428,10 @@ if (process.env.COVERAGE) {
   });
 }
 
+if (process.env.CI && runner.hasFocusedTestsOrSuites()) {
+  console.error('ERROR: "focused" tests/suites are prohibitted on bots. Remove any "fit"/"fdescribe" declarations.');
+  process.exit(1);
+}
 runner.run();
 /**
  * @param {!EventEmitter} emitter
diff --git a/utils/testrunner/TestRunner.js b/utils/testrunner/TestRunner.js
index 6f1308adbb9..19e45f8d395 100644
--- a/utils/testrunner/TestRunner.js
+++ b/utils/testrunner/TestRunner.js
@@ -360,6 +360,10 @@ class TestRunner extends EventEmitter {
     return tests;
   }
 
+  hasFocusedTestsOrSuites() {
+    return this._hasFocusedTestsOrSuites;
+  }
+
   tests() {
     return this._tests.slice();
   }