diff --git a/erpnext/setup/doctype/naming_series/naming_series.py b/erpnext/setup/doctype/naming_series/naming_series.py
index 5a12051..cfe2222 100644
--- a/erpnext/setup/doctype/naming_series/naming_series.py
+++ b/erpnext/setup/doctype/naming_series/naming_series.py
@@ -117,7 +117,7 @@
 
 	def validate_series_name(self, n):
 		import re
-		if not re.match("^[\w- /.#]*$", n, re.UNICODE):
+		if not re.match("^[\w\- /.#]*$", n, re.UNICODE):
 			throw(_('Special Characters except "-", "#", "." and "/" not allowed in naming series'))
 
 	def get_options(self, arg=None):