diff --git a/addons/web_kanban/static/src/css/Makefile b/addons/web_kanban/static/src/css/Makefile
new file mode 100644
index 00000000000..cae8f74448f
--- /dev/null
+++ b/addons/web_kanban/static/src/css/Makefile
@@ -0,0 +1,3 @@
+kanban.css: kanban.sass
+	sass -t expanded kanban.sass kanban.css
+
diff --git a/addons/web_kanban/static/src/css/kanban.css b/addons/web_kanban/static/src/css/kanban.css
index f16bd58bc5e..60967f50afd 100644
--- a/addons/web_kanban/static/src/css/kanban.css
+++ b/addons/web_kanban/static/src/css/kanban.css
@@ -1,3 +1,4 @@
+@charset "utf-8";
 .openerp .oe_kanban_view {
   height: inherit;
 }
@@ -64,9 +65,6 @@
 .openerp .oe_kanban_view .oe_kanban_column.oe_kanban_grouped, .openerp .oe_kanban_view .oe_kanban_group_header {
   background: #f0eeee;
 }
-.openerp .oe_kanban_view .oe_kanban_group_header.oe_kanban_no_group {
-  display: none;
-}
 .openerp .oe_kanban_view .oe_kanban_column.oe_kanban_grouped, .openerp .oe_kanban_view .oe_kanban_group_header {
   border-left: 1px solid #f0f8f8;
   border-right: 1px solid #b9b9b9;
diff --git a/addons/web_kanban/static/src/css/kanban.sass b/addons/web_kanban/static/src/css/kanban.sass
index 9ba57befe31..94daf4bd3cd 100644
--- a/addons/web_kanban/static/src/css/kanban.sass
+++ b/addons/web_kanban/static/src/css/kanban.sass
@@ -77,9 +77,6 @@
     .oe_kanban_column.oe_kanban_grouped, .oe_kanban_group_header
         background: #f0eeee
 
-    .oe_kanban_group_header.oe_kanban_no_group
-        display: none
-
     .oe_kanban_column.oe_kanban_grouped, .oe_kanban_group_header
         border-left: 1px solid #f0f8f8
         border-right: 1px solid #b9b9b9