diff --git a/src/version.ts b/src/version.ts
index 531fbc9..46d1af0 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1,4 +1,4 @@
 // Version string of this package injected at build time.
 declare const __PACKAGE_VERSION__: string | undefined;
 export const VERSION: string =
-  __PACKAGE_VERSION__ === undefined ? '0.0.0-test' : __PACKAGE_VERSION__;
+  typeof __PACKAGE_VERSION__ === 'undefined' ? '0.0.0-test' : __PACKAGE_VERSION__;