diff --git a/mod/assign/lib.php b/mod/assign/lib.php
index 91d7b556c26..486aaeca8b6 100644
--- a/mod/assign/lib.php
+++ b/mod/assign/lib.php
@@ -613,7 +613,14 @@ function assign_print_recent_activity($course, $viewfullnames, $timestart) {
 
     foreach ($show as $submission) {
         $cm = $modinfo->get_cm($submission->cmid);
+        $context = context_module::instance($submission->cmid);
+        $assign = new assign($context, $cm, $cm->course);
         $link = $CFG->wwwroot.'/mod/assign/view.php?id='.$cm->id;
+        // Obscure first and last name if blind marking enabled.
+        if ($assign->is_blind_marking()) {
+            $submission->firstname = get_string('participant', 'mod_assign');
+            $submission->lastname = $assign->get_uniqueid_for_user($submission->userid);
+        }
         print_recent_activity_note($submission->timemodified,
                                    $submission,
                                    $cm->name,
diff --git a/mod/assign/tests/lib_test.php b/mod/assign/tests/lib_test.php
index f24a792218f..b55c5c661f8 100644
--- a/mod/assign/tests/lib_test.php
+++ b/mod/assign/tests/lib_test.php
@@ -145,6 +145,30 @@ class mod_assign_lib_testcase extends mod_assign_base_testcase {
         assign_print_recent_activity($this->course, false, time() - 3600);
     }
 
+    /** Make sure blind marking shows participant \d+ not fullname when assign_print_recent_activity is triggered. */
+    public function test_print_recent_activity_fullname_blind_marking() {
+        // Submitting an assignment generates a notification in blind marking.
+        $this->preventResetByRollback();
+        $sink = $this->redirectMessages();
+
+        $this->setUser($this->editingteachers[0]);
+        $assign = $this->create_instance(array('blindmarking' => 1));
+
+        $data = new stdClass();
+        $data->userid = $this->students[0]->id;
+        $notices = array();
+        $this->setUser($this->students[0]);
+        $assign->submit_for_grading($data, $notices);
+
+        $this->setUser($this->editingteachers[0]);
+        $uniqueid = $assign->get_uniqueid_for_user($data->userid);
+        $expectedstr = preg_quote(get_string('participant', 'mod_assign'), '/') . '.*' . $uniqueid;
+        $this->expectOutputRegex("/{$expectedstr}/");
+        assign_print_recent_activity($this->course, false, time() - 3600);
+
+        $sink->close();
+    }
+
     public function test_assign_get_recent_mod_activity() {
         $this->setUser($this->editingteachers[0]);
         $assign = $this->create_instance();