diff --git a/addons/web/static/src/js/view_list.js b/addons/web/static/src/js/view_list.js
index 9b6710aafa2..f9f845f889c 100644
--- a/addons/web/static/src/js/view_list.js
+++ b/addons/web/static/src/js/view_list.js
@@ -158,7 +158,7 @@ openerp.web.ListView = openerp.web.View.extend( /** @lends openerp.web.ListView#
             var pair = this.colors[i],
                 color = pair[0],
                 expression = pair[1];
-            if (py.evaluate(expression, context)) {
+            if (py.evaluate(expression, _.extend({bool: py.bool}, context))) {
                 return 'color: ' + color + ';';
             }
             // TODO: handle evaluation errors
diff --git a/addons/web/static/src/js/view_tree.js b/addons/web/static/src/js/view_tree.js
index 902b5a99526..dea53793ffb 100644
--- a/addons/web/static/src/js/view_tree.js
+++ b/addons/web/static/src/js/view_tree.js
@@ -146,7 +146,7 @@ openerp.web.TreeView = openerp.web.View.extend(/** @lends openerp.web.TreeView#
             var pair = this.colors[i],
                 color = pair[0],
                 expression = pair[1];
-            if (py.evaluate(expression, context)) {
+            if (py.evaluate(expression, _.extend({bool: py.bool}, context))) {
                 return 'color: ' + color + ';';
             }
             // TODO: handle evaluation errors