diff --git a/defender/urls.py b/defender/urls.py
index 548d6ed..3f4a654 100644
--- a/defender/urls.py
+++ b/defender/urls.py
@@ -5,9 +5,9 @@ urlpatterns = patterns(
     '',
     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"),
 )