diff --git a/ihatemoney/messages.pot b/ihatemoney/messages.pot
index bc8a8f39..bd4dcc49 100644
--- a/ihatemoney/messages.pot
+++ b/ihatemoney/messages.pot
@@ -182,6 +182,12 @@ msgstr ""
 msgid "The bill has been modified"
 msgstr ""
 
+msgid "Sorry, we were unable to find the page you've asked for."
+msgstr ""
+
+msgid "The best thing to do is probably to get back to the main page."
+msgstr ""
+
 msgid "Back to the list"
 msgstr ""
 
diff --git a/ihatemoney/run.py b/ihatemoney/run.py
index 1a5ac17e..e9b3ce16 100644
--- a/ihatemoney/run.py
+++ b/ihatemoney/run.py
@@ -2,7 +2,7 @@ import os
 import os.path
 import warnings
 
-from flask import Flask, g, request, session
+from flask import Flask, g, request, session, render_template
 from flask_babel import Babel
 from flask_mail import Mail
 from flask_migrate import Migrate, upgrade, stamp
@@ -102,6 +102,10 @@ def validate_configuration(app):
         )
 
 
+def page_not_found(e):
+    return render_template('404.html', root="main"), 404
+
+
 def create_app(configuration=None, instance_path='/etc/ihatemoney',
                instance_relative_config=True):
     app = Flask(
@@ -121,8 +125,9 @@ def create_app(configuration=None, instance_path='/etc/ihatemoney',
     validate_configuration(app)
     app.register_blueprint(web_interface)
     app.register_blueprint(api)
+    app.register_error_handler(404, page_not_found)
 
-    # Configure the application
+    # Configure the a, root="main"pplication
     setup_database(app)
 
     mail = Mail()
diff --git a/ihatemoney/templates/404.html b/ihatemoney/templates/404.html
new file mode 100644
index 00000000..7e282c2e
--- /dev/null
+++ b/ihatemoney/templates/404.html
@@ -0,0 +1,13 @@
+{% extends "layout.html" %}
+
+{% block body %}
+    <header id="header" class="row">
+      <div class="col-xs-12 col-sm-5 offset-md-2">
+            <h2>{{ _("Sorry, we were unable to find the page you've asked for.") }}</h2>
+        </div>
+    </header>
+    <main class="row home">
+        <div class="col-xs-12 col-sm-5 col-md-4 offset-md-2">
+          <a href='{{ url_for("main.home") }}'>{{ _("The best thing to do is probably to get back to the main page.")}}</a>
+        </div>
+{% endblock %}
diff --git a/ihatemoney/templates/layout.html b/ihatemoney/templates/layout.html
index cb36a6fe..3523ef7b 100644
--- a/ihatemoney/templates/layout.html
+++ b/ihatemoney/templates/layout.html
@@ -32,13 +32,13 @@
         <span class="navbar-toggler-icon"></span>
       </button>
       <div class="collapse navbar-collapse" id="navbarToggler">
-        <h1><a class="navbar-brand" href="{{ url_for(".home") }}">#! money?</a></h1>
+        <h1><a class="navbar-brand" href="{{ url_for("main.home") }}">#! money?</a></h1>
         <ul class="navbar-nav ml-auto mr-auto">
           {% if g.project %}
           {% block navbar %}
-          <li class="nav-item{% if current_view == 'list_bills' %} active{% endif %}"><a class="nav-link" href="{{ url_for(".list_bills") }}">{{ _("Bills") }}</a></li>
-          <li class="nav-item{% if current_view == 'settle_bill' %} active{% endif %}"><a class="nav-link" href="{{ url_for(".settle_bill") }}">{{ _("Settle") }}</a></li>
-          <li class="nav-item{% if current_view == 'statistics' %} active{% endif %}"><a class="nav-link" href="{{ url_for(".statistics") }}">{{ _("Statistics") }}</a></li>
+          <li class="nav-item{% if current_view == 'list_bills' %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.list_bills") }}">{{ _("Bills") }}</a></li>
+          <li class="nav-item{% if current_view == 'settle_bill' %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.settle_bill") }}">{{ _("Settle") }}</a></li>
+          <li class="nav-item{% if current_view == 'statistics' %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.statistics") }}">{{ _("Statistics") }}</a></li>
           {% endblock %}
           {% endif %}
         </ul>
@@ -47,23 +47,23 @@
           <li class="nav-item dropdown">
             <a href="#" class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><strong>{{ g.project.name }}</strong> {{ _("options") }} <b class="caret"></b></a>
             <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
-              <li><a class="dropdown-item" href="{{ url_for(".edit_project") }}">{{ _("Project settings") }}</a></li>
+              <li><a class="dropdown-item" href="{{ url_for("main.edit_project") }}">{{ _("Project settings") }}</a></li>
               <li class="dropdown-divider"></li>
               {% for id, name in session['projects'] %}
               {% if id != g.project.id %}
-              <li><a class="dropdown-item" href="{{ url_for(".list_bills", project_id=id) }}">{{ _("switch to") }} {{ name }}</a></li>
+              <li><a class="dropdown-item" href="{{ url_for("main.list_bills", project_id=id) }}">{{ _("switch to") }} {{ name }}</a></li>
               {% endif %}
               {% endfor %}
-              <li><a class="dropdown-item" href="{{ url_for(".create_project") }}">{{ _("Start a new project") }}</a></li>
+              <li><a class="dropdown-item" href="{{ url_for("main.create_project") }}">{{ _("Start a new project") }}</a></li>
               <li class="dropdown-divider"></li>
-              <li><a class="dropdown-item" href="{{ url_for(".exit") }}">{{ _("Logout") }}</a></li>
+              <li><a class="dropdown-item" href="{{ url_for("main.exit") }}">{{ _("Logout") }}</a></li>
             </ul>
           </li>
           {% endif %}
-          <li class="nav-item{% if g.lang == "fr" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".change_lang", lang="fr") }}">fr</a></li>
-          <li class="nav-item{% if g.lang == "en" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".change_lang", lang="en") }}">en</a></li>
+          <li class="nav-item{% if g.lang == "fr" %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.change_lang", lang="fr") }}">fr</a></li>
+          <li class="nav-item{% if g.lang == "en" %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.change_lang", lang="en") }}">en</a></li>
           {% if g.show_admin_dashboard_link %}
-          <li class="nav-item{% if request.url_rule.endpoint == "main.dashboard" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".dashboard") }}">{{ _("Dashboard") }}</a></li>
+          <li class="nav-item{% if request.url_rule.endpoint == "main.dashboard" %} active{% endif %}"><a class="nav-link" href="{{ url_for("main.dashboard") }}">{{ _("Dashboard") }}</a></li>
           {% endif %}
         </ul>
       </div>
diff --git a/ihatemoney/translations/fr/LC_MESSAGES/messages.mo b/ihatemoney/translations/fr/LC_MESSAGES/messages.mo
index 3fa8d8f4..ab8a8316 100644
Binary files a/ihatemoney/translations/fr/LC_MESSAGES/messages.mo and b/ihatemoney/translations/fr/LC_MESSAGES/messages.mo differ
diff --git a/ihatemoney/translations/fr/LC_MESSAGES/messages.po b/ihatemoney/translations/fr/LC_MESSAGES/messages.po
index ccab28b1..b3e2fdbe 100644
--- a/ihatemoney/translations/fr/LC_MESSAGES/messages.po
+++ b/ihatemoney/translations/fr/LC_MESSAGES/messages.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2018-07-16 23:26+0200\n"
+"POT-Creation-Date: 2018-08-05 23:41+0200\n"
 "PO-Revision-Date: 2018-05-15 22:00+0200\n"
 "Last-Translator: Adrien CLERC <>\n"
 "Language: fr\n"
@@ -16,7 +16,7 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Generated-By: Babel 2.5.3\n"
+"Generated-By: Babel 2.6.0\n"
 
 msgid "Project name"
 msgstr "Nom de projet"
@@ -210,6 +210,12 @@ msgstr "La facture a été supprimée"
 msgid "The bill has been modified"
 msgstr "La facture a été modifiée"
 
+msgid "Sorry, we were unable to find the page you've asked for."
+msgstr "Navré, nous ne trouvons pas la page que vous avez demandé."
+
+msgid "The best thing to do is probably to get back to the main page."
+msgstr "Votre meilleure piste est probablement la page d'accueil."
+
 msgid "Back to the list"
 msgstr "Retourner à la liste"
 
@@ -488,4 +494,3 @@ msgstr "Solde"
 
 #~ msgid "Invite"
 #~ msgstr "Invitez"
-