diff --git a/src/ActivityLogger.php b/src/ActivityLogger.php
index 147a6e90..40532ebc 100644
--- a/src/ActivityLogger.php
+++ b/src/ActivityLogger.php
@@ -77,6 +77,19 @@ public function by($modelOrId)
         return $this->causedBy($modelOrId);
     }
 
+    public function causedByAnonymous()
+    {
+        $this->activity->causer_id = null;
+        $this->activity->causer_type = null;
+
+        return $this;
+    }
+
+    public function byAnonymous()
+    {
+        return $this->causedByAnonymous();
+    }
+
     public function withProperties($properties)
     {
         $this->getActivity()->properties = collect($properties);
diff --git a/tests/ActivityLoggerTest.php b/tests/ActivityLoggerTest.php
index 5040f952..8cb7bf34 100644
--- a/tests/ActivityLoggerTest.php
+++ b/tests/ActivityLoggerTest.php
@@ -195,6 +195,32 @@ public function it_will_use_the_logged_in_user_as_the_causer_by_default()
         $this->assertEquals($userId, $this->getLastActivity()->causer->id);
     }
 
+    /** @test */
+    public function it_can_log_activity_using_an_anonymous_causer()
+    {
+        activity()
+            ->causedByAnonymous()
+            ->log('hello poetsvrouwman');
+
+        $this->assertNull($this->getLastActivity()->causer_id);
+        $this->assertNull($this->getLastActivity()->causer_type);
+    }
+
+    /** @test */
+    public function it_will_override_the_logged_in_user_as_the_causer_when_an_anonymous_causer_is_specified()
+    {
+        $userId = 1;
+
+        Auth::login(User::find($userId));
+
+        activity()
+            ->byAnonymous()
+            ->log('hello poetsvrouwman');
+
+        $this->assertNull($this->getLastActivity()->causer_id);
+        $this->assertNull($this->getLastActivity()->causer_type);
+    }
+
     /** @test */
     public function it_can_replace_the_placeholders()
     {