diff --git a/lib/vagrant/bundler.rb b/lib/vagrant/bundler.rb
index c1613f612..28ec66674 100644
--- a/lib/vagrant/bundler.rb
+++ b/lib/vagrant/bundler.rb
@@ -24,8 +24,8 @@ module Vagrant
 
     # Default gem repositories
     DEFAULT_GEM_SOURCES = [
-      "https://rubygems.org/".freeze,
-      HASHICORP_GEMSTORE
+      HASHICORP_GEMSTORE,
+      "https://rubygems.org/".freeze
     ].freeze
 
     def self.instance
@@ -62,7 +62,12 @@ module Vagrant
 
       # Add HashiCorp RubyGems source
       if !Gem.sources.include?(HASHICORP_GEMSTORE)
+        current_sources = Gem.sources.sources.dup
+        Gem.sources.clear
         Gem.sources << HASHICORP_GEMSTORE
+        current_sources.each do |src|
+          Gem.sources << src
+        end
       end
 
       # Generate dependencies for all registered plugins
diff --git a/test/unit/vagrant/bundler_test.rb b/test/unit/vagrant/bundler_test.rb
index d27474349..4428be470 100644
--- a/test/unit/vagrant/bundler_test.rb
+++ b/test/unit/vagrant/bundler_test.rb
@@ -34,6 +34,31 @@ describe Vagrant::Bundler do
     end
   end
 
+  describe "DEFAULT_GEM_SOURCES" do
+    it "should list hashicorp gemstore first" do
+      expect(described_class.const_get(:DEFAULT_GEM_SOURCES).first).to eq(
+        described_class.const_get(:HASHICORP_GEMSTORE))
+    end
+  end
+
+  describe "#init!" do
+    context "Gem.sources" do
+      before {
+        Gem.sources.clear
+        Gem.sources << "https://rubygems.org/" }
+
+      it "should add hashicorp gem store" do
+        subject.init!([])
+        expect(Gem.sources).to include(described_class.const_get(:HASHICORP_GEMSTORE))
+      end
+
+      it "should add hashicorp gem store to start of sources list" do
+        subject.init!([])
+        expect(Gem.sources.sources.first.uri.to_s).to eq(described_class.const_get(:HASHICORP_GEMSTORE))
+      end
+    end
+  end
+
   describe "#install" do
     let(:plugins){ {"my-plugin" => {"gem_version" => "> 0"}} }