diff --git a/src/groups/index.js b/src/groups/index.js
index d8392623da..f98ef0e7a8 100644
--- a/src/groups/index.js
+++ b/src/groups/index.js
@@ -54,7 +54,7 @@ Groups.removeEphemeralGroups = function (groups) {
 	return groups;
 };
 
-var isPrivilegeGroupRegex = /^cid:\d+:privileges:[\w:]+$/;
+var isPrivilegeGroupRegex = /^cid:\d+:privileges:[\w\-:]+$/;
 Groups.isPrivilegeGroup = function (groupName) {
 	return isPrivilegeGroupRegex.test(groupName);
 };