diff --git a/roles/matrix-ldap-registration-proxy/defaults/main.yml b/roles/matrix-ldap-registration-proxy/defaults/main.yml
index 15f597495..469a2f295 100644
--- a/roles/matrix-ldap-registration-proxy/defaults/main.yml
+++ b/roles/matrix-ldap-registration-proxy/defaults/main.yml
@@ -39,9 +39,10 @@ matrix_ldap_registration_proxy_systemd_required_services_list: ['docker.service'
 # List of systemd services that matrix_ldap_registration_proxy.service wants
 matrix_ldap_registration_proxy_systemd_wanted_services_list: []
 
-# Default LDAP configuration template which covers the generic use case.
-# You can customize it by controlling the various variables inside it.
-matrix_ldap_registration_proxy_configuration_env: "{{ lookup('template', 'templates/ldap-registration-proxy.env.j2') }}"
+# Additional environment variables to pass to the LDAP proxy environment variables.
+#
+# Example:
+# matrix_ldap_registration_proxy_env_variables_extension: |
+#   KEY=value
+matrix_ldap_registration_proxy_env_variables_extension: ''
 
-# Holds the final LDAP configuration (a combination of the default and its extension).
-matrix_ldap_registration_proxy_configuration: "{{ matrix_ldap_registration_proxy_configuration_env }}"
diff --git a/roles/matrix-ldap-registration-proxy/tasks/setup_install.yml b/roles/matrix-ldap-registration-proxy/tasks/setup_install.yml
index 1f0307ec3..870373370 100644
--- a/roles/matrix-ldap-registration-proxy/tasks/setup_install.yml
+++ b/roles/matrix-ldap-registration-proxy/tasks/setup_install.yml
@@ -37,8 +37,8 @@
   when: true
 
 - name: Ensure matrix_ldap_registration_proxy config installed
-  ansible.builtin.copy:
-    content: "{{ matrix_ldap_registration_proxy_configuration }}"
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/ldap-registration-proxy.env.j2"
     dest: "{{ matrix_ldap_registration_proxy_config_path }}/ldap-registration-proxy.env"
     mode: 0644
     owner: "{{ matrix_user_username }}"
diff --git a/roles/matrix-ldap-registration-proxy/templates/ldap-registration-proxy.env.j2 b/roles/matrix-ldap-registration-proxy/templates/ldap-registration-proxy.env.j2
index e7ee29ba1..581a0b0d8 100644
--- a/roles/matrix-ldap-registration-proxy/templates/ldap-registration-proxy.env.j2
+++ b/roles/matrix-ldap-registration-proxy/templates/ldap-registration-proxy.env.j2
@@ -30,3 +30,6 @@ MATRIX_SERVER_URL={{ matrix_ldap_registration_proxy_matrix_server_url }}
 
 # Specify the port to listen on. Default to 8080
 LISTEN_PORT={{ matrix_ldap_registration_proxy_container_port }}
+
+# Use this to extend the configuration with custom variables
+{{ matrix_ldap_registration_proxy_env_variables_extension }}