diff --git a/commentaries/urls.py b/commentaries/urls.py
index 7d3280cb2d93dd748b51713f6c7f20cd390a8484..b3c4e999c7119ae5d1b063efd5c80c3820cffd71 100644
--- a/commentaries/urls.py
+++ b/commentaries/urls.py
@@ -6,7 +6,7 @@ from . import views
 urlpatterns = [
     # Commentaries
     url(r'^$', views.CommentaryListView.as_view(), name='commentaries'),
-    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]+)/$',
+    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]{1,3})/$',
         views.CommentaryListView.as_view(), name='browse'),
     url(r'^howto$', TemplateView.as_view(template_name='commentaries/howto.html'), name='howto'),
 
diff --git a/submissions/urls.py b/submissions/urls.py
index bdd6d86f6cc0619472dad96b3bd14996cf081713..6191c3b6638edf6933853c961bcfc033ef83a840 100644
--- a/submissions/urls.py
+++ b/submissions/urls.py
@@ -6,7 +6,7 @@ from . import views
 urlpatterns = [
     # Submissions
     url(r'^$', views.SubmissionListView.as_view(), name='submissions'),
-    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]+)/$', views.SubmissionListView.as_view(), name='browse'),
+    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]{1,3})/$', views.SubmissionListView.as_view(), name='browse'),
     url(r'^sub_and_ref_procedure$',
         TemplateView.as_view(template_name='submissions/sub_and_ref_procedure.html'),
         name='sub_and_ref_procedure'),
diff --git a/theses/urls.py b/theses/urls.py
index 5f8baf0e35cb4f7e7564746256b3cb99b58589a8..392a03a506201c587c66fcd1443cacf865db753c 100644
--- a/theses/urls.py
+++ b/theses/urls.py
@@ -6,7 +6,7 @@ from . import views
 urlpatterns = [
     # Thesis Links
     url(r'^$', views.ThesisListView.as_view(), name='theses'),
-    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]+)/$', views.ThesisListView.as_view(), name='browse'),
+    url(r'^browse/(?P<discipline>[a-z]+)/(?P<nrweeksback>[0-9]{1,3})/$', views.ThesisListView.as_view(), name='browse'),
     url(r'^(?P<thesislink_id>[0-9]+)/$', views.thesis_detail, name='thesis'),
     url(r'^request_thesislink$', views.RequestThesisLink.as_view(), name='request_thesislink'),
     url(r'^unvetted_thesislinks$', views.UnvettedThesisLinks.as_view(), name='unvetted_thesislinks'),