diff --git a/src/Symfony/Bridge/PhpUnit/CHANGELOG.md b/src/Symfony/Bridge/PhpUnit/CHANGELOG.md
index 9b8a974ecc5e6..e7e3e29862bd4 100644
--- a/src/Symfony/Bridge/PhpUnit/CHANGELOG.md
+++ b/src/Symfony/Bridge/PhpUnit/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.2
+---
+
+ * Add support for mocking the `hrtime()` function
+
 6.1
 ---
 
diff --git a/src/Symfony/Bridge/PhpUnit/ClockMock.php b/src/Symfony/Bridge/PhpUnit/ClockMock.php
index 7280d44dc16f8..d2e150084bdda 100644
--- a/src/Symfony/Bridge/PhpUnit/ClockMock.php
+++ b/src/Symfony/Bridge/PhpUnit/ClockMock.php
@@ -90,6 +90,19 @@ public static function gmdate($format, $timestamp = null)
         return \gmdate($format, $timestamp);
     }
 
+    public static function hrtime($asNumber = false)
+    {
+        $ns = (self::$now - (int) self::$now) * 1000000000;
+
+        if ($asNumber) {
+            $number = sprintf('%d%d', (int) self::$now, $ns);
+
+            return PHP_INT_SIZE === 8 ? (int) $number : (float) $number;
+        }
+
+        return [(int) $ns, (int) self::$now];
+    }
+
     public static function register($class)
     {
         $self = static::class;
@@ -137,6 +150,11 @@ function gmdate(\$format, \$timestamp = null)
 {
     return \\$self::gmdate(\$format, \$timestamp);
 }
+
+function hrtime(\$asNumber = false)
+{
+    return \\$self::hrtime(\$asNumber);
+}
 EOPHP
             );
         }
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/ClockMockTest.php b/src/Symfony/Bridge/PhpUnit/Tests/ClockMockTest.php
index 5af0617ba5a7f..de39909681a1d 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/ClockMockTest.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/ClockMockTest.php
@@ -69,4 +69,14 @@ public function testGmDate()
 
         $this->assertSame('1555075769', gmdate('U'));
     }
+
+    public function testHrTime()
+    {
+        $this->assertSame([125000000, 1234567890], hrtime());
+    }
+
+    public function testHrTimeAsNumber()
+    {
+        $this->assertSame(1234567890125000000, hrtime(true));
+    }
 }