diff --git a/addons/web_kanban_sparkline/static/src/js/kanban_sparkline.js b/addons/web_kanban_sparkline/static/src/js/kanban_sparkline.js
index 1d185b7cacd..c3bdfa2d5b4 100644
--- a/addons/web_kanban_sparkline/static/src/js/kanban_sparkline.js
+++ b/addons/web_kanban_sparkline/static/src/js/kanban_sparkline.js
@@ -14,6 +14,7 @@ instance.web_kanban.SparklineBarWidget = instance.web_kanban.AbstractField.exten
             var value = _.pluck(self.field.value, 'value');
             var tooltips = _.pluck(self.field.value, 'tooltip');
             var suffix = self.options.tooltip_suffix || "";
+            var tooltipFormat = self.options.type == 'tristate' && '{{offset:offset}}' + suffix || '{{offset:offset}} {{value:value}}' + suffix
             var sparkline_options = _.extend({
                     type: 'bar',
                     barWidth: 5,
@@ -21,7 +22,7 @@ instance.web_kanban.SparklineBarWidget = instance.web_kanban.AbstractField.exten
                     barWidth: 4,
                     barSpacing: 1,
                     barColor: '#96d854',
-                    tooltipFormat: '{{offset:offset}} {{value}} ' + suffix,
+                    tooltipFormat: tooltipFormat,
                     chartRangeMin: 0,
                     tooltipValueLookups: {
                         'offset': tooltips