diff --git a/auquotidien/modules/formpage.py b/auquotidien/modules/formpage.py
index fa8c0e0..11da23b 100644
--- a/auquotidien/modules/formpage.py
+++ b/auquotidien/modules/formpage.py
@@ -18,6 +18,11 @@ from wcs.qommon import emails
 OldFormPage = wcs.forms.root.FormPage
 
 class AlternateFormPage(OldFormPage):
+    def __call__(self):
+        # Fix missing trailing slash; lose query string on purpose.
+        path = quixote.get_path()
+        return quixote.redirect(path + "/", permanent=True)
+
     def form_side(self, *args, **kwargs):
         form_side_html = OldFormPage.form_side(self, *args, **kwargs)
         # add a 'Steps' title
diff --git a/auquotidien/modules/root.py b/auquotidien/modules/root.py
index be002d3..2af917d 100644
--- a/auquotidien/modules/root.py
+++ b/auquotidien/modules/root.py
@@ -287,6 +287,10 @@ class AlternateRootDirectory(OldRootDirectory):
             except KeyError:
                 pass
             else:
+                if len(path) == 1:
+                    # category with missing trailing slash, redirect.
+                    path = quixote.get_path()
+                    return quixote.redirect(path + "/", permanent=True)
                 return FormsRootDirectory(cat)._q_traverse(path[1:])
 
             raise e
diff --git a/tests/test_user_pages.py b/tests/test_user_pages.py
index 1e7611c..8e7b3c0 100644
--- a/tests/test_user_pages.py
+++ b/tests/test_user_pages.py
@@ -135,6 +135,25 @@ def test_form_category_redirection():
     resp = get_app(pub).get('/foobar/')
     assert resp.location.endswith('/baz/foobar/')
 
+    # check missing trailing slashs are ok
+    resp = get_app(pub).get('/foobar')
+    assert resp.location.endswith('/baz/foobar')
+    resp = resp.follow()
+    assert resp.location.endswith('/baz/foobar/')
+
+    # even if there's a query string
+    resp = get_app(pub).get('/foobar?test=1')
+    assert resp.location.endswith('/baz/foobar?test=1')
+    resp = resp.follow()
+    assert resp.location.endswith('/baz/foobar/')
+
+    # check direct category access without trailing slash
+    resp = get_app(pub).get('/baz')
+    assert resp.location.endswith('/baz/')
+    resp = get_app(pub).get('/baz?test=1')
+    assert resp.location.endswith('/baz/')
+
+
 def test_form_and_category_same_slug():
     Category.wipe()
     cat = Category(name='foobar')