diff --git a/htdocs/projet/activity/perday.php b/htdocs/projet/activity/perday.php
index c984bd30ea5..b07b41c1b88 100644
--- a/htdocs/projet/activity/perday.php
+++ b/htdocs/projet/activity/perday.php
@@ -586,27 +586,27 @@ print '</td>';
 print "</tr>\n";
 
 print '<tr class="liste_titre">';
-if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<td>'.$langs->trans("Project").'</td>';
-if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<td>'.$langs->trans("ThirdParty").'</td>';
-print '<td>'.$langs->trans("Task").'</td>';
+if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<th>'.$langs->trans("Project").'</th>';
+if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<th>'.$langs->trans("ThirdParty").'</th>';
+print '<th>'.$langs->trans("Task").'</th>';
 // TASK fields
 $extrafieldsobjectkey='projet_task';
 $extrafieldsobjectprefix='efpt.';
 include DOL_DOCUMENT_ROOT.'/core/tpl/extrafields_list_search_title.tpl.php';
 if (! empty($arrayfields['t.planned_workload']['checked']))
 {
-    print '<td class="right leftborder plannedworkload maxwidth100">'.$langs->trans("PlannedWorkload").'</td>';
+    print '<th class="right leftborder plannedworkload maxwidth100">'.$langs->trans("PlannedWorkload").'</th>';
 }
 if (! empty($arrayfields['t.progress']['checked']))
 {
-    print '<td class="right maxwidth100">'.$langs->trans("ProgressDeclared").'</td>';
+    print '<th class="right maxwidth100">'.$langs->trans("ProgressDeclared").'</th>';
 }
 /*print '<td class="right maxwidth100">'.$langs->trans("TimeSpent").'</td>';
 if ($usertoprocess->id == $user->id) print '<td class="right maxwidth100">'.$langs->trans("TimeSpentByYou").'</td>';
 else print '<td class="right maxwidth100">'.$langs->trans("TimeSpentByUser").'</td>';*/
-print '<td class="right maxwidth100">'.$langs->trans("TimeSpent").'<br>('.$langs->trans("Everybody").')</td>';
-print '<td class="right maxwidth100">'.$langs->trans("TimeSpent").($usertoprocess->firstname?'<br>('.dol_trunc($usertoprocess->firstname, 10).')':'').'</td>';
-print '<td class="center leftborder">'.$langs->trans("HourStart").'</td>';
+print '<th class="right maxwidth100">'.$langs->trans("TimeSpent").'<br>('.$langs->trans("Everybody").')</th>';
+print '<th class="right maxwidth100">'.$langs->trans("TimeSpent").($usertoprocess->firstname?'<br>('.dol_trunc($usertoprocess->firstname, 10).')':'').'</th>';
+print '<th class="center leftborder">'.$langs->trans("HourStart").'</td>';
 
 // By default, we can edit only tasks we are assigned to
 $restrictviewformytask=((! isset($conf->global->PROJECT_TIME_SHOW_TASK_NOT_ASSIGNED)) ? 2 : $conf->global->PROJECT_TIME_SHOW_TASK_NOT_ASSIGNED);
@@ -643,8 +643,8 @@ if (! $isavailable[$daytoparse]['morning'] && ! $isavailable[$daytoparse]['after
 elseif (! $isavailable[$daytoparse]['morning'])   $cssonholiday.='onholidaymorning ';
 elseif (! $isavailable[$daytoparse]['afternoon']) $cssonholiday.='onholidayafternoon ';
 
-print '<td class="center'.($cssonholiday?' '.$cssonholiday:'').($cssweekend?' '.$cssweekend:'').'">'.$langs->trans("Duration").'</td>';
-print '<td class="center">'.$langs->trans("Note").'</td>';
+print '<th class="center'.($cssonholiday?' '.$cssonholiday:'').($cssweekend?' '.$cssweekend:'').'">'.$langs->trans("Duration").'</th>';
+print '<th class="center">'.$langs->trans("Note").'</th>';
 //print '<td class="center"></td>';
 print_liste_field_titre($selectedfields, $_SERVER["PHP_SELF"], "", '', '', '', $sortfield, $sortorder, 'center maxwidthsearch ');
 
diff --git a/htdocs/projet/activity/perweek.php b/htdocs/projet/activity/perweek.php
index a037466d935..f5db207a42e 100644
--- a/htdocs/projet/activity/perweek.php
+++ b/htdocs/projet/activity/perweek.php
@@ -639,26 +639,26 @@ print '</td>';
 print "</tr>\n";
 
 print '<tr class="liste_titre">';
-if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<td>'.$langs->trans("Project").'</td>';
-if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<td>'.$langs->trans("ThirdParty").'</td>';
-print '<td>'.$langs->trans("Task").'</td>';
+if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<th>'.$langs->trans("Project").'</th>';
+if (! empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT)) print '<th>'.$langs->trans("ThirdParty").'</th>';
+print '<th>'.$langs->trans("Task").'</th>';
 // TASK fields
 $extrafieldsobjectkey='projet_task';
 $extrafieldsobjectprefix='efpt.';
 include DOL_DOCUMENT_ROOT.'/core/tpl/extrafields_list_search_title.tpl.php';
 if (! empty($arrayfields['t.planned_workload']['checked']))
 {
-    print '<td class="leftborder plannedworkload maxwidth75 right">'.$langs->trans("PlannedWorkload").'</td>';
+    print '<th class="leftborder plannedworkload maxwidth75 right">'.$langs->trans("PlannedWorkload").'</th>';
 }
 if (! empty($arrayfields['t.progress']['checked']))
 {
-    print '<td class="maxwidth75 right">'.$langs->trans("ProgressDeclared").'</td>';
+    print '<th class="maxwidth75 right">'.$langs->trans("ProgressDeclared").'</th>';
 }
 /*print '<td class="maxwidth75 right">'.$langs->trans("TimeSpent").'</td>';
  if ($usertoprocess->id == $user->id) print '<td class="maxwidth75 right">'.$langs->trans("TimeSpentByYou").'</td>';
  else print '<td class="maxwidth75 right">'.$langs->trans("TimeSpentByUser").'</td>';*/
-print '<td class="maxwidth75 right">'.$langs->trans("TimeSpent").'<br>('.$langs->trans("Everybody").')</td>';
-print '<td class="maxwidth75 right">'.$langs->trans("TimeSpent").($usertoprocess->firstname?'<br>('.dol_trunc($usertoprocess->firstname, 10).')':'').'</td>';
+print '<th class="maxwidth75 right">'.$langs->trans("TimeSpent").'<br>('.$langs->trans("Everybody").')</th>';
+print '<th class="maxwidth75 right">'.$langs->trans("TimeSpent").($usertoprocess->firstname?'<br>('.dol_trunc($usertoprocess->firstname, 10).')':'').'</th>';
 
 for ($idw=0; $idw<7; $idw++)
 {
@@ -678,7 +678,7 @@ for ($idw=0; $idw<7; $idw++)
 	elseif (! $isavailable[$tmpday]['morning'])   $cssonholiday.='onholidaymorning ';
 	elseif (! $isavailable[$tmpday]['afternoon']) $cssonholiday.='onholidayafternoon ';
 
-	print '<td width="6%" align="center" class="bold hide'.$idw.($cssonholiday?' '.$cssonholiday:'').($cssweekend?' '.$cssweekend:'').'">'.dol_print_date($dayinloopfromfirstdaytoshow, '%a').'<br>'.dol_print_date($dayinloopfromfirstdaytoshow, 'dayreduceformat').'</td>';
+	print '<th width="6%" align="center" class="bold hide'.$idw.($cssonholiday?' '.$cssonholiday:'').($cssweekend?' '.$cssweekend:'').'">'.dol_print_date($dayinloopfromfirstdaytoshow, '%a').'<br>'.dol_print_date($dayinloopfromfirstdaytoshow, 'dayreduceformat').'</th>';
 }
 //print '<td></td>';
 print_liste_field_titre($selectedfields, $_SERVER["PHP_SELF"], "", '', '', '', $sortfield, $sortorder, 'center maxwidthsearch ');