diff --git a/keycloak/files/server/realms.json b/keycloak/files/server/realms.json
index 35ef4b4..a08a5a7 100644
--- a/keycloak/files/server/realms.json
+++ b/keycloak/files/server/realms.json
@@ -7,7 +7,7 @@
   "sslRequired": "external",
   "requiredCredentials": [ "password" ],
   {%- for parameter_name, parameter_value in realm.get('additional_params', {}).items() %}
-  "{{ parameter_name }}": {{ parameter_value }},
+  "{{ parameter_name }}": {{ parameter_value|json }},
   {%- endfor %}
   "clients": [
     {%- for client_name, client in realm.get('client', {}).iteritems() %}