diff --git a/sdk/lib/_internal/wasm/lib/uri_patch.dart b/sdk/lib/_internal/wasm/lib/uri_patch.dart
index 5bbea44..002aedd 100644
--- a/sdk/lib/_internal/wasm/lib/uri_patch.dart
+++ b/sdk/lib/_internal/wasm/lib/uri_patch.dart
@@ -28,7 +28,7 @@
   static bool get _isWindows => _isWindowsCached;
 
   static final bool _isWindowsCached = JS<bool>("""() => {
-        return typeof process != undefined &&
+        return typeof process != "undefined" &&
                Object.prototype.toString.call(process) == "[object process]" &&
                process.platform == "win32"
       }""");