diff --git a/Makefile b/Makefile
index 3e9b9610a5..d6f3526cd0 100644
--- a/Makefile
+++ b/Makefile
@@ -64,7 +64,10 @@ test-browser:
 	node $(BROWSERIFY_CMD) -e test/_browser.js >dist/6to5-test.js
 	rm -rf templates.json tests.json
 
-	test -n "`which open`" && open test/browser.html
+	if [ -n $$BROWSER ]; then $$BROWSER test/browser.html; \
+	elif which xdg-open > /dev/null; then xdg-open 'test/browser.html'; \
+	elif which gnome-open > /dev/null; then gnome-open 'test/browser.html'; \
+	elif which open > /dev/null; then open 'test/browser.html'; fi \
 
 publish:
 	git pull --rebase
diff --git a/test/fixtures/transformation/es6-let-scoping/switch-break/exec.js b/test/fixtures/transformation/es6-let-scoping/switch-break/exec.js
new file mode 100644
index 0000000000..0e7eb1fb2f
--- /dev/null
+++ b/test/fixtures/transformation/es6-let-scoping/switch-break/exec.js
@@ -0,0 +1,11 @@
+if (true) {
+  const x = 1;
+  switch (x) {
+    case 1: {
+      function y() {
+        assert(x, 1);
+      };
+      break;
+    }
+  }
+}