diff --git a/gnocchi/files/4.0/gnocchi.conf b/gnocchi/files/4.0/gnocchi.conf
index 3346841..1658172 100644
--- a/gnocchi/files/4.0/gnocchi.conf
+++ b/gnocchi/files/4.0/gnocchi.conf
@@ -122,7 +122,9 @@
 
 [oslo_middleware]
 
+{%- if server.enable_proxy_headers_parsing is defined %}
 enable_proxy_headers_parsing = {{ server.enable_proxy_headers_parsing }}
+{%- endif %}
 
 [statsd]