diff --git a/web/skins/classic/views/filter.php b/web/skins/classic/views/filter.php
index 8445d2c12..f5aada6b4 100644
--- a/web/skins/classic/views/filter.php
+++ b/web/skins/classic/views/filter.php
@@ -482,7 +482,7 @@ if ( ZM_OPT_MESSAGE ) {
             </p>
             <p>
               <label for="ExecuteInterval"><?php echo translate('Execute Interval') ?></label>
-              <input type="number" id="filter[ExecuteInterval]" name="filter[ExecuteInterval]" min="0" step="1" value="<?php echo $filter->ExecuteInterval() ?>" />
+              <input type="number" id="filter[ExecuteInterval]" name="filter[ExecuteInterval]" min="0" step="1" value="<?php echo $filter->ExecuteInterval() ?>" /><?php echo translate('seconds'); ?>
             </p>
             <p>
               <label for="Concurrent"><?php echo translate('ConcurrentFilter') ?></label>