diff --git a/tools/node.js b/tools/node.js
index 614e083d..075dcf76 100644
--- a/tools/node.js
+++ b/tools/node.js
@@ -72,7 +72,7 @@ exports.minify = function(files, options) {
             ? file
             : fs.readFileSync(file, "utf8");
         toplevel = UglifyJS.parse(code, {
-            filename: options.fromString ? "?" : file,
+            filename: options.fromString ? options.fileName : file,
             toplevel: toplevel
         });
     });