diff --git a/docker/files/etc/nginx/conf.d/default.conf b/docker/files/etc/nginx/conf.d/default.conf
index 2644822c..e5967e33 100644
--- a/docker/files/etc/nginx/conf.d/default.conf
+++ b/docker/files/etc/nginx/conf.d/default.conf
@@ -88,5 +88,11 @@ server {
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+        # Increase proxy buffer size to allow keycloak to send large
+        # header responses when a user is created.
+        proxy_buffer_size 128k;
+        proxy_buffers 4 256k;
+        proxy_busy_buffers_size 256k;
     }
 }