diff --git a/lib/vagrant/action/builtin/mixin_synced_folders.rb b/lib/vagrant/action/builtin/mixin_synced_folders.rb
index 7ffa64d03..5bdc287a8 100644
--- a/lib/vagrant/action/builtin/mixin_synced_folders.rb
+++ b/lib/vagrant/action/builtin/mixin_synced_folders.rb
@@ -65,7 +65,7 @@ module Vagrant
             next if data[:disabled]
 
             impl = ""
-            impl = data[:type].to_sym if data[:type]
+            impl = data[:type].to_sym if data[:type] && !data[:type].empty?
 
             if impl != ""
               impl_class = plugins[impl]
diff --git a/test/unit/vagrant/action/builtin/mixin_synced_folders_test.rb b/test/unit/vagrant/action/builtin/mixin_synced_folders_test.rb
index 6d96990f7..d24063109 100644
--- a/test/unit/vagrant/action/builtin/mixin_synced_folders_test.rb
+++ b/test/unit/vagrant/action/builtin/mixin_synced_folders_test.rb
@@ -74,11 +74,15 @@ describe Vagrant::Action::Builtin::MixinSyncedFolders do
 
     it "should return the proper set of folders" do
       folders["root"] = {}
+      folders["another"] = { type: "" }
       folders["nfs"] = { type: "nfs" }
 
       result = subject.synced_folders(machine)
       result.length.should == 2
-      result[:default].should == { "root" => folders["root"] }
+      result[:default].should == {
+        "another" => folders["another"],
+        "root" => folders["root"],
+      }
       result[:nfs].should == { "nfs" => folders["nfs"] }
     end