diff --git a/module/models/skill.mjs b/module/models/skill.mjs
index a3a4276..06f5db3 100644
--- a/module/models/skill.mjs
+++ b/module/models/skill.mjs
@@ -28,8 +28,8 @@ export default class CthulhuEternalSkill extends foundry.abstract.TypeDataModel
 
   computeScore() {
     let actor = this.parent?.actor;
-    if (Number(this.base)) {
-      return Number(this.base) + this.bonus;
+    if ( isFinite(this.base) ) {
+      return Number(this.base) + Number(this.bonus);
     }
     if (!actor) {
       return `${this.base} + ${  String(this.bonus)}`;