diff --git a/tools/run-all.js b/tools/run-all.js
index 127c6fa4ef..c302109053 100644
--- a/tools/run-all.js
+++ b/tools/run-all.js
@@ -35,8 +35,8 @@ var Runner = function (options) {
 
   self.stopped = false;
   self.quiet = options.quiet;
-  self.banner =
-    options.banner || files.prettyPath(self.projectContext.projectDir);
+  self.banner = options.banner ||
+    files.convertToOSPath(files.prettyPath(self.projectContext.projectDir));
   if (options.rootUrl) {
     self.rootUrl = options.rootUrl;
   } else if (options.proxyHost) {