diff --git a/library/Icinga/Web/View/helpers/format.php b/library/Icinga/Web/View/helpers/format.php
index e3c1790364..a52b72aec0 100644
--- a/library/Icinga/Web/View/helpers/format.php
+++ b/library/Icinga/Web/View/helpers/format.php
@@ -43,7 +43,7 @@
         return '';
     }
     return sprintf(
-        '<span class="text-small time-ago" title="%s">%s</span>',
+        '<span class="relative-time" title="%s">%s</span>',
         DateFormatter::formatDateTime($time),
         DateFormatter::timeAgo($time, $timeOnly)
     );
@@ -54,7 +54,7 @@
         return '';
     }
     return sprintf(
-        '<span class="text-small time-since" title="%s">%s</span>',
+        '<span class="relative-time" title="%s">%s</span>',
         DateFormatter::formatDateTime($time),
         DateFormatter::timeSince($time, $timeOnly)
     );
@@ -65,7 +65,7 @@
         return '';
     }
     return sprintf(
-        '<span class="text-small time-until" title="%s">%s</span>',
+        '<span class="relative-time" title="%s">%s</span>',
         DateFormatter::formatDateTime($time),
         DateFormatter::timeUntil($time, $timeOnly)
     );