diff --git a/emsdk b/emsdk
index 5a96e69..fde9c8a 100644
--- a/emsdk
+++ b/emsdk
@@ -14,7 +14,7 @@ if EMSDK_DEV and not 'active_path' in sys.argv:
 else:
   emsdk_master_server = 'https://s3.amazonaws.com/mozilla-games/emscripten/'
 
-emsdk_packages_url = urlparse.urljoin(emsdk_master_server, 'packages')
+emsdk_packages_url = urlparse.urljoin(emsdk_master_server, 'packages/')
 
 emscripten_git_repo = 'git@github.com:kripken/emscripten.git'