diff --git a/admin/tables.py b/admin/tables.py
index c5c715632..0e8d48000 100644
--- a/admin/tables.py
+++ b/admin/tables.py
@@ -45,7 +45,7 @@ class DomainsTable(tables.Table):
 
 class ExtensionsTable(tables.Table):
     idkey = "id"
-    selection = tables.SelectionColumn("selection", width="4%", first=True)
+    selection = tables.SelectionColumn("selection", width="4%", header=False)
     name = tables.Column("name", label=ugettext_noop("Name"), width="15%")
     version = tables.Column("version", label=ugettext_noop("Version"), width="6%")
     descr = tables.Column("description", label=ugettext_noop("Description"))
diff --git a/lib/tables.py b/lib/tables.py
index cca913077..c7425df9d 100644
--- a/lib/tables.py
+++ b/lib/tables.py
@@ -40,7 +40,9 @@ class SelectionColumn(Column):
     usefull to select rows for grouped actions (modify, delete, etc.)
     """
     def __str__(self):
-        return "<input type='checkbox' name='selectall' id='selectall' />"
+        if self.header:
+            return "<input type='checkbox' name='selectall' id='selectall' />"
+        return ""
 
     def render(self, value, selection):
         return "<input type='checkbox' id='%s' name='select_%s' value='%s' %s/>" \