diff --git a/defender/urls.py b/defender/urls.py
index 8603868..42d2852 100644
--- a/defender/urls.py
+++ b/defender/urls.py
@@ -4,9 +4,9 @@ from .views import block_view, unblock_ip_view, unblock_username_view
 urlpatterns = [
     url(r'^blocks/$', block_view,
         name="defender_blocks_view"),
-    url(r'^blocks/ip/(?P<ip_address>[a-z0-9-._]+)/unblock$', unblock_ip_view,
+    url(r'^blocks/ip/(?P<ip_address>[A-Za-z0-9-._]+)/unblock$', unblock_ip_view,
         name="defender_unblock_ip_view"),
-    url(r'^blocks/username/(?P<username>[a-z0-9-._@]+)/unblock$',
+    url(r'^blocks/username/(?P<username>[A-Za-z0-9-._@]+)/unblock$',
         unblock_username_view,
         name="defender_unblock_username_view"),
 ]