diff --git a/templates/table/structure/display_structure.phtml b/templates/table/structure/display_structure.phtml
index 07ee204c22..aaa40905dc 100644
--- a/templates/table/structure/display_structure.phtml
+++ b/templates/table/structure/display_structure.phtml
@@ -64,7 +64,7 @@ $rownum = 0; $odd_row = true; ?>
                 }
                 if (in_array($field_name, $columns_with_index)) {
                     $displayed_field_name .= Util::getImage(
-                        'bd_primary.png', __('Index')
+                        'b_key.png', __('Index')
                     );
                 }
             ?>
diff --git a/themes/original/img/b_key.png b/themes/original/img/b_key.png
new file mode 100644
index 0000000000..44d8f8c86e
Binary files /dev/null and b/themes/original/img/b_key.png differ
diff --git a/themes/pmahomme/img/b_key.png b/themes/pmahomme/img/b_key.png
new file mode 100644
index 0000000000..b6c71c7037
Binary files /dev/null and b/themes/pmahomme/img/b_key.png differ