diff --git a/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_chart.tsx b/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_chart.tsx
index a600d59865cc..82e751627a05 100644
--- a/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_chart.tsx
+++ b/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_chart.tsx
@@ -224,7 +224,7 @@ export const ExpressionChart: React.FC<Props> = ({
               />
             </>
           ) : null}
-          {isAbove ? (
+          {isAbove && first(expression.threshold) != null ? (
             <RectAnnotation
               id="upper-threshold"
               style={{