diff --git a/test/mocha/reduce.js b/test/mocha/reduce.js
index dcc0993f..366db94d 100644
--- a/test/mocha/reduce.js
+++ b/test/mocha/reduce.js
@@ -466,4 +466,23 @@ describe("test/reduce.js", function() {
             "// }",
         ].join("\n"));
     });
+    it("Should transform `export default (42)` correctly", function() {
+        var code = [
+            "export default (42);",
+            "for (var k in this)",
+            "    console.log(k);",
+        ].join("\n");
+        var result = reduce_test(code, {
+            compress: false,
+            mangle: false,
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, [
+            "// Can't reproduce test failure",
+            "// minify options: {",
+            '//   "compress": false,',
+            '//   "mangle": false',
+            "// }",
+        ].join("\n"));
+    });
 });
diff --git a/test/sandbox.js b/test/sandbox.js
index c1932269..f85fa24e 100644
--- a/test/sandbox.js
+++ b/test/sandbox.js
@@ -54,8 +54,8 @@ exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expec
 exports.patch_module_statements = function(code) {
     var count = 0, has_default = "", imports = [];
     code = code.replace(/\bexport(?:\s*\{[^{}]*}\s*?(?:$|\n|;)|\s+default\b(?:\s*(\(|\{|class\s*\{|class\s+(?=extends\b)|(?:async\s+)?function\s*(?:\*\s*)?\())?|\b)/g, function(match, header) {
+        if (/^export\s+default/.test(match)) has_default = "var _uglify_export_default_;";
         if (!header) return "";
-        has_default = "var _uglify_export_default_;";
         if (header.length == 1) return "0, " + header;
         var name = "_uglify_export_default_";
         if (/^class\b/.test(header)) do {