diff --git a/template/opvaskemaskine.yaml b/template/opvaskemaskine.yaml
index 864f64f..493f50a 100644
--- a/template/opvaskemaskine.yaml
+++ b/template/opvaskemaskine.yaml
@@ -23,6 +23,7 @@
         {% set v = states.sensor.opvaskemaskine_spaending.state | float %}
         {% set a = states.sensor.opvaskemaskine_strom.state | float %}
         {% set wp = states.sensor.opvaskemaskine_energi.state | float %}
+        {% set ap = v * a %}
         {% if ap > 0 %}
           {% set pf = wp / ap * 100 %}
           {{ pf | round(2) }}