diff --git a/defaults/main.yml b/defaults/main.yml
index 18c2bf3..11bbb1c 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -55,12 +55,12 @@ nginx_proxy_redirect: "off"
 nginx_x_forwarded_host: "$remote_addr"
 nginx_default_proxy_buffers_size: 8
 nginx_proxy_buffer_size: '{{ nginx_default_proxy_buffers_size }}k'
-nginx_proxy_buffers: '4 {{ nginx_proxy_buffer_size }}k'
-nginx_proxy_busy_buffers_size: '{{ nginx_proxy_buffer_size * 2 }}k'
+nginx_proxy_buffers: '4 {{ nginx_default_proxy_buffers_size }}k'
+nginx_proxy_busy_buffers_size: '{{ nginx_default_proxy_buffers_size * 2 }}k'
 nginx_proxy_connect_timeout: 30s
 nginx_proxy_read_timeout: 480s
 nginx_proxy_send_timeout: 120s
-nginx_proxy_temp_file_write_size: '{{ nginx_proxy_buffer_size * 2 }}k'
+nginx_proxy_temp_file_write_size: '{{ nginx_default_proxy_buffers_size * 2 }}k'
 nginx_proxy_force_ranges: "off"
 nginx_client_max_body_size: 100M
 nginx_client_body_timeout: 240s