diff --git a/config/packages/modules/climate/windows.yaml b/config/packages/modules/climate/windows.yaml
index 8f9adc3..bfbc3de 100644
--- a/config/packages/modules/climate/windows.yaml
+++ b/config/packages/modules/climate/windows.yaml
@@ -107,7 +107,7 @@ sensor:
           - binary_sensor.kitchen_window
         friendly_name: Open window count
         value_template: >-
-          {{ set entityStates = states | selectattr('entity_id', 'in', state_attr('group.all_windows', 'entity_id')) %}
+          {% set entityStates = states | selectattr('entity_id', 'in', state_attr('group.all_windows', 'entity_id')) %}
           {{ entityStates | selectattr('state', 'eq', 'on') | list | count | int }}
 
 #