diff --git a/src/index.ts b/src/index.ts
index a833188..8e2bddf 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,7 +3,7 @@ export function getUserAgent(): string {
     return navigator.userAgent;
   }
 
-  if (typeof process === "object" && "version" in process) {
+  if (typeof process === "object" && process.version !== undefined) {
     return `Node.js/${process.version.substr(1)} (${process.platform}; ${
       process.arch
     })`;