diff --git a/source/_docs/scripts/service-calls.markdown b/source/_docs/scripts/service-calls.markdown
index b61170a4cfd1..896126b7aa4e 100644
--- a/source/_docs/scripts/service-calls.markdown
+++ b/source/_docs/scripts/service-calls.markdown
@@ -103,7 +103,7 @@ target:
       thermostat.downstairs
     {% endif %}
 data:
-  temperature: {{ 22 - distance(states.device_tracker.paulus) }}
+  temperature: "{{ 22 - distance(states.device_tracker.paulus) }}"
 ```
 
 {% endraw %}