diff --git a/tools/build.js b/tools/build.js
index 721f513..97df510 100644
--- a/tools/build.js
+++ b/tools/build.js
@@ -254,7 +254,7 @@ function buildBrowser(sources, dir, tmpDir, depsRequireCode, minify, npmPackage,
 
 var root = process.cwd();
 // Since rm -rf is called, better be sure...
-if (path.basename(root).toLowerCase().indexOf("bluebird") !== 0) {
+if (path.basename(root).toLowerCase().indexOf("node-bluebird") !== 0) {
     throw new Error("cwd must be set to bluebird project root. cwd is currently\n\n" +
         "         " + process.cwd() + "\n");
 }