diff --git a/common/src/util/saxy.ts b/common/src/util/saxy.ts
index b49422c01e..c055cc3e07 100644
--- a/common/src/util/saxy.ts
+++ b/common/src/util/saxy.ts
@@ -163,7 +163,7 @@ const parseEntities = (input: string): string => {
         value = parseInt(entityName.slice(1), 10)
       }
 
-      if (isNaN(value)) {
+      if (Number.isNaN(value)) {
         parts.push('&' + entityName + ';')
       } else {
         parts.push(String.fromCharCode(value))