diff --git a/lib/cli/run-helpers.js b/lib/cli/run-helpers.js
index d020768aed..e574e1fbd2 100644
--- a/lib/cli/run-helpers.js
+++ b/lib/cli/run-helpers.js
@@ -196,7 +196,7 @@ exports.singleRun = (mocha, {files = [], exit = false} = {}) => {
   mocha.files = files;
   const runner = mocha.run(exit ? exitMocha : exitMochaLater);
 
-  process.on('SIGINT', () => {
+  process.once('SIGINT', () => {
     debug('aborting runner');
     runner.abort();
 
@@ -204,6 +204,7 @@ exports.singleRun = (mocha, {files = [], exit = false} = {}) => {
     // Instead of `process.exit(130)`, set runner.failures to 130 (exit code for SIGINT)
     // The amount of failures will be emitted as error code later
     runner.failures = 130;
+    setImmediate(() => process.kill(process.pid, 'SIGINT'));
   });
 };
 
diff --git a/lib/stats-collector.js b/lib/stats-collector.js
index 1c1491ca81..0afa10f1cd 100644
--- a/lib/stats-collector.js
+++ b/lib/stats-collector.js
@@ -1,8 +1,15 @@
 'use strict';
 
+/**
+ * Provides a factory function for a {@link StatsCollector} object.
+ * @private
+ * @module
+ */
+
 /**
  * Test statistics collector.
  *
+ * @private
  * @typedef {Object} StatsCollector
  * @property {number} suites - integer count of suites run.
  * @property {number} tests - integer count of tests run.
@@ -15,14 +22,16 @@
  */
 
 /**
- * Provides stats such as test duration,
- * number of tests passed / failed etc.
+ * Provides stats such as test duration, number of tests passed / failed etc., by listening for events emitted by `runner`.
  *
- * @public
- * @memberof Mocha
- * @param {Runner} runner
+ * @private
+ * @param {Runner} runner - Runner instance
+ * @throws {TypeError} If falsy `runner`
  */
 function createStatsCollector(runner) {
+  /**
+   * @type StatsCollector
+   */
   var stats = {
     suites: 0,
     tests: 0,