diff --git a/plugins/ldap/Gemfile b/plugins/ldap/Gemfile
index 0508b1d..e10329e 100644
--- a/plugins/ldap/Gemfile
+++ b/plugins/ldap/Gemfile
@@ -1,2 +1,3 @@
+source 'https://rubygems.org'
 gem "net-ldap", "~> 0.12.1"
 gem "magic", ">= 0.2.8"
--
libgit2 0.21.2