diff --git a/addons/web/static/src/js/framework/pyeval.js b/addons/web/static/src/js/framework/pyeval.js
index bcab0b0717f..ea24ac87ecc 100644
--- a/addons/web/static/src/js/framework/pyeval.js
+++ b/addons/web/static/src/js/framework/pyeval.js
@@ -627,13 +627,15 @@ var relativedelta = py.type('relativedelta', null, {
         this._fix();
     },
     _fix: function () {
+        var self = this;
         var months = asJS(this.ops.months);
         if (Math.abs(months) > 11) {
             var s = months > 0 ? 1 : -1;
-            var r = utils.divmod(months * s, 12);
-            this.ops.months = py.float.fromJSON(r.mod*s);
-            this.ops.years = py.float.fromJSON(
-                asJS(this.ops.years) + r.div*s);
+            utils.divmod(months * s, 12, function (years, months) {
+                self.ops.months = py.float.fromJSON(months*s);
+                self.ops.years = py.float.fromJSON(
+                    asJS(self.ops.years) + years*s);
+            });
         }
         this._has_time = 0;
     },
diff --git a/addons/web/static/test/evals.js b/addons/web/static/test/evals.js
index b6a3b4177e8..1fbf6523bac 100644
--- a/addons/web/static/test/evals.js
+++ b/addons/web/static/test/evals.js
@@ -300,6 +300,14 @@ odoo.define_section('eval.types', ['web.pyeval'], function (test, mock) {
             py.eval("(datetime.date(2015,2,5)+relativedelta(days=-6,weekday=0)).strftime('%Y-%m-%d')",
                     pyeval.context()),
             '2015-02-02');
+        strictEqual(
+            py.eval("(datetime.date(2018, 2, 1) + relativedelta(years=7, months=42, days=42)).strftime('%Y-%m-%d')",
+                    pyeval.context()),
+            '2028-09-12');
+        strictEqual(
+            py.eval("(datetime.date(2018, 2, 1) + relativedelta(years=-7, months=-42, days=-42)).strftime('%Y-%m-%d')",
+                    pyeval.context()),
+            '2007-06-20');
     });
 
     test('datetime.tojson', function (assert, pyeval) {