diff --git a/defaults/main.yml b/defaults/main.yml
index 7d75ea2..4d38a17 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -8,4 +8,4 @@ nginx_tls_private_key: ""
 nginx_tls_intermediate_ca: ""
 nginx_pfs_enabled: False
 nginx_dhparam_size: '4069'
-nginx_dhparam_file: '/etc/pki/tls/certs/dhparam-{{dhparam_size}}.pem'
+nginx_dhparam_file: '/etc/pki/tls/certs/dhparam-{{ nginx_dhparam_size }}.pem'