diff --git a/lib/tests/cronlib_test.php b/lib/tests/cronlib_test.php
index 4d7a1b5e1a7..66b33a99dcd 100644
--- a/lib/tests/cronlib_test.php
+++ b/lib/tests/cronlib_test.php
@@ -44,8 +44,8 @@ class cronlib_testcase extends basic_testcase {
 
         // Relative time stamps. Did you know data providers get executed during phpunit init?
         $lastweekstime = strtotime('-1 week') - time();
-        $beforelastweekstime = $lastweekstime - 60;
-        $afterlastweekstime = $lastweekstime + 60;
+        $beforelastweekstime = $lastweekstime - 3600 - 1; // At least 1h and 1s diff (make it DST immune).
+        $afterlastweekstime = $lastweekstime + 3600 + 1; // At least 1h and 1s diff (make it DST immune).
 
         $nodes = array();
         // Really old directory to remove.