diff --git a/charts/pihole/templates/oauth2-proxy-config.yaml b/charts/pihole/templates/oauth2-proxy-config.yaml
index 1365162..1ce0ffa 100644
--- a/charts/pihole/templates/oauth2-proxy-config.yaml
+++ b/charts/pihole/templates/oauth2-proxy-config.yaml
@@ -50,7 +50,7 @@
 
     cookie_name = "_oauth2_proxy_pihole"
     cookie_secret = "123456789012345678901234567890--"
-    cookie_domains = "pihole.{{ .Values.domain }}"
+    cookie_domains = "pihole.p.{{ .Values.domain }}"
     cookie_expire = "168h"
     cookie_refresh = "100h"
     cookie_secure = true