diff --git a/plugins/commands/login/middleware/add_authentication.rb b/plugins/commands/login/middleware/add_authentication.rb
index a30f026e6..79083424d 100644
--- a/plugins/commands/login/middleware/add_authentication.rb
+++ b/plugins/commands/login/middleware/add_authentication.rb
@@ -35,11 +35,15 @@ module VagrantPlugins
         token  = client.token
 
         env[:box_urls].map! do |url|
-          u = URI.parse(url)
-          if u.host != TARGET_HOST && REPLACEMENT_HOSTS.include?(u.host)
-            u.host = TARGET_HOST
-            u.to_s
-          else
+          begin
+            u = URI.parse(url)
+            if u.host != TARGET_HOST && REPLACEMENT_HOSTS.include?(u.host)
+              u.host = TARGET_HOST
+              u.to_s
+            else
+              url
+            end
+          rescue URI::Error
             url
           end
         end
diff --git a/test/unit/plugins/commands/login/middleware/add_authentication_test.rb b/test/unit/plugins/commands/login/middleware/add_authentication_test.rb
index 8b7f40048..9a46506e7 100644
--- a/test/unit/plugins/commands/login/middleware/add_authentication_test.rb
+++ b/test/unit/plugins/commands/login/middleware/add_authentication_test.rb
@@ -125,6 +125,15 @@ describe VagrantPlugins::LoginCommand::AddAuthentication do
       end
     end
 
+    it "ignores urls that it cannot parse" do
+      bad_url = "this is not a valid url"
+      # Ensure the bad URL does cause an exception
+      expect{ URI.parse(bad_url) }.to raise_error URI::Error
+      env[:box_urls] = [bad_url]
+      subject.call(env)
+      expect(env[:box_urls].first).to eq(bad_url)
+    end
+
     it "returns original urls when not modified" do
       to_persist = "file:////path/to/box.box"
       to_change = VagrantPlugins::LoginCommand::AddAuthentication::