1 files changed, 6 insertions, 1 deletions
diff --git a/addons/web/static/src/js/fields/basic_fields.js b/addons/web/static/src/js/fields/basic_fields.js
index 7a7b3fa370f..ce1a305277f 100644
--- a/addons/web/static/src/js/fields/basic_fields.js
+++ b/addons/web/static/src/js/fields/basic_fields.js
@@ -21,6 +21,7 @@ var framework = require('web.framework');
 var session = require('web.session');
 var utils = require('web.utils');
 var view_dialogs = require('web.view_dialogs');
+var field_utils = require('web.field_utils');
 
 var qweb = core.qweb;
 var _t = core._t;
@@ -1127,6 +1128,10 @@ var AbstractFieldBinary = AbstractField.extend({
 });
 
 var FieldBinaryImage = AbstractFieldBinary.extend({
+    fieldDependencies: _.extend({}, AbstractFieldBinary.prototype.fieldDependencies, {
+        __last_update: {type: 'datetime'},
+    }),
+
     template: 'FieldBinaryImage',
     placeholder: "/web/static/src/img/placeholder.png",
     events: _.extend({}, AbstractFieldBinary.prototype.events, {
@@ -1149,7 +1154,7 @@ var FieldBinaryImage = AbstractFieldBinary.extend({
                     id: JSON.stringify(this.res_id),
                     field: this.nodeOptions.preview_image || this.name,
                     // unique forces a reload of the image when the record has been updated
-                    unique: (this.recordData.__last_update || '').replace(/[^0-9]/g, ''),
+                    unique: field_utils.format.datetime(this.recordData.__last_update).replace(/[^0-9]/g, ''),
                 });
             }
         }