diff --git a/mod/lesson/mod.html b/mod/lesson/mod.html
index 1c28a1bf077..9164c70ca85 100644
--- a/mod/lesson/mod.html
+++ b/mod/lesson/mod.html
@@ -478,7 +478,7 @@ if ($form->mode == "add") {
 <tr>
     <td align="right"><b><?php  print_string("conditionsfordependency", "lesson"); ?>:</b></td>
     <td>
-        <table cellpadding="5px">
+        <table cellpadding="5">
             <tr align="center">
                 <td><?php  print_string("timespentminutes", "lesson"); ?></td>
                 <td><?php  print_string("completed", "lesson"); ?></td>