diff --git a/mod/forum/tests/lib_test.php b/mod/forum/tests/lib_test.php
index 69ac1fd9a07..5aee4dca258 100644
--- a/mod/forum/tests/lib_test.php
+++ b/mod/forum/tests/lib_test.php
@@ -881,8 +881,8 @@ class mod_forum_lib_testcase extends advanced_testcase {
         // Adding timed discussions.
         $CFG->forum_enabletimedposts = true;
         $now = $record->timemodified;
-        $past = $now - 60;
-        $future = $now + 60;
+        $past = $now - 600;
+        $future = $now + 600;
 
         $record = new stdClass();
         $record->course = $course->id;
@@ -1125,8 +1125,8 @@ class mod_forum_lib_testcase extends advanced_testcase {
         // Adding timed discussions.
         $CFG->forum_enabletimedposts = true;
         $now = $record->timemodified;
-        $past = $now - 60;
-        $future = $now + 60;
+        $past = $now - 600;
+        $future = $now + 600;
 
         $record = new stdClass();
         $record->course = $course->id;