diff --git a/app/main/views.py b/app/main/views.py
index 7cdb4d60adb5049ed07b9be7947301e972f1fc4b..b98736b0e5e2607fdede36988c7b7977f2771e25 100644
--- a/app/main/views.py
+++ b/app/main/views.py
@@ -9,7 +9,8 @@ This module implements the main blueprint.
 :license: BSD 2-Clause, see LICENSE for more details.
 
 """
-from flask import Blueprint, render_template, jsonify
+import os
+from flask import Blueprint, render_template, jsonify, request, current_app
 from flask_login import login_required
 from .. import utils
 
@@ -34,6 +35,24 @@ def handle_csentry_error(error):
     return response
 
 
+@bp.app_url_defaults
+def modified_static_file(endpoint, values):
+    """Add a last modified query parameter to static resource
+
+    Force the browser to invalidate the cache and reload resources
+    when files have changed
+
+    Inspired from http://flask.pocoo.org/snippets/40/ and
+    https://gist.github.com/Ostrovski/f16779933ceee3a9d181
+    """
+    if endpoint == 'static':
+        filename = values.get('filename')
+        if filename:
+            # The same static folder is used for all blueprints
+            file_path = os.path.join(current_app.static_folder, filename)
+            values['m'] = int(os.stat(file_path).st_mtime)
+
+
 @bp.route('/')
 @login_required
 def index():