diff --git a/CloseFolder.py b/CloseFolder.py
index 2e6e80c..143c215 100644
--- a/CloseFolder.py
+++ b/CloseFolder.py
@@ -23,7 +23,8 @@ class CloseFolderDirs(sublime_plugin.WindowCommand):
 	def run(self, dirs=[]):
 		views = sublime.active_window().views()
 		for dr in dirs:
-			dr += '\\'
+			dr = os.path.join(os.path.normpath(dr), "")
 			for vw in views:
-				if (os.path.dirname(vw.file_name()) + '\\').find(dr) == 0:
-					vw.close()
+				if vw.file_name():
+					if os.path.join(os.path.normpath(os.path.dirname(vw.file_name())), "").find(dr) == 0:
+						vw.close()