diff --git a/src/app/prediction-delta/prediction-delta.component.html b/src/app/prediction-delta/prediction-delta.component.html
index dc14936..8e47150 100644
--- a/src/app/prediction-delta/prediction-delta.component.html
+++ b/src/app/prediction-delta/prediction-delta.component.html
@@ -2,7 +2,7 @@
 
 <rb-form-input label="Prediction A" [(ngModel)]="nameA"></rb-form-input>
 <rb-form-input label="Prediction B" [(ngModel)]="nameB"></rb-form-input>
-<p *ngIf="delta">
+<p *ngIf="delta !== undefined">
 	The result is {{ delta }}.
 </p>
 <rb-icon-button icon="forward-right" mode="primary" (click)="compare()">