diff --git a/roles/zeitbild_backend/templates/conf.json.j2 b/roles/zeitbild_backend/templates/conf.json.j2
index 87bb2e8..e6d8bfb 100644
--- a/roles/zeitbild_backend/templates/conf.json.j2
+++ b/roles/zeitbild_backend/templates/conf.json.j2
@@ -9,7 +9,7 @@
 		}
 	],
 	"server": {
-		"address": {{var_zeitbild_backend_address}},
+		"address": "{{var_zeitbild_backend_address}}",
 		"port": {{var_zeitbild_backend_port | string}}
 	},
 {% if var_zeitbild_backend_database_kind == 'sqlite' %}
@@ -25,7 +25,7 @@
 		"kind": "postgresql",
 		"data": {
 			"host": "{{var_zeitbild_backend_database_data_postgresql_host}}",
-			"port": "{{var_zeitbild_backend_database_data_postgresql_port | string}}",
+			"port": {{var_zeitbild_backend_database_data_postgresql_port | string}},
 			"username": "{{var_zeitbild_backend_database_data_postgresql_username}}",
 			"password": "{{var_zeitbild_backend_database_data_postgresql_password}}",
 			"schema": "{{var_zeitbild_backend_database_data_postgresql_schema}}"