diff --git a/lib/vagrant/capability_host.rb b/lib/vagrant/capability_host.rb
index 4c77930fa..c75f3c980 100644
--- a/lib/vagrant/capability_host.rb
+++ b/lib/vagrant/capability_host.rb
@@ -32,7 +32,7 @@ module Vagrant
       end
 
       if !host
-        host = autodetect_capability_host(hosts) if !host
+        host = autodetect_capability_host(hosts, *args) if !host
         raise Errors::CapabilityHostNotDetected if !host
       end
 
diff --git a/test/unit/base.rb b/test/unit/base.rb
index 4218abcbf..db530c2e4 100644
--- a/test/unit/base.rb
+++ b/test/unit/base.rb
@@ -14,6 +14,7 @@ require "unit/support/dummy_communicator"
 require "unit/support/dummy_provider"
 require "unit/support/shared/base_context"
 require "unit/support/shared/action_synced_folders_context"
+require "unit/support/shared/capability_helpers_context"
 require "unit/support/shared/virtualbox_context"
 
 # Do not buffer output
diff --git a/test/unit/support/shared/capability_helpers_context.rb b/test/unit/support/shared/capability_helpers_context.rb
new file mode 100644
index 000000000..f336cc7c3
--- /dev/null
+++ b/test/unit/support/shared/capability_helpers_context.rb
@@ -0,0 +1,21 @@
+shared_context "capability_helpers" do
+  def detect_class(result)
+    Class.new do
+      define_method(:detect?) do
+        result
+      end
+    end
+  end
+
+  def cap_instance(name, options=nil)
+    options ||= {}
+
+    Class.new do
+      if !options[:corrupt]
+        define_method(name) do |*args|
+          raise "cap: #{name} #{args.inspect}"
+        end
+      end
+    end.new
+  end
+end
diff --git a/test/unit/vagrant/capability_host_test.rb b/test/unit/vagrant/capability_host_test.rb
index d35e81afb..d460a649b 100644
--- a/test/unit/vagrant/capability_host_test.rb
+++ b/test/unit/vagrant/capability_host_test.rb
@@ -3,32 +3,14 @@ require File.expand_path("../../base", __FILE__)
 require "vagrant/capability_host"
 
 describe Vagrant::CapabilityHost do
+  include_context "capability_helpers"
+
   subject do
     Class.new do
       extend Vagrant::CapabilityHost
     end
   end
 
-  def detect_class(result)
-    Class.new do
-      define_method(:detect?) do
-        result
-      end
-    end
-  end
-
-  def cap_instance(name, options=nil)
-    options ||= {}
-
-    Class.new do
-      if !options[:corrupt]
-        define_method(name) do |*args|
-          raise "cap: #{name} #{args.inspect}"
-        end
-      end
-    end.new
-  end
-
   describe "#initialize_capabilities! and #capability_host_chain" do
     it "raises an error if an explicit host is not found" do
       expect { subject.initialize_capabilities!(:foo, {}, {}) }.
@@ -45,6 +27,21 @@ describe Vagrant::CapabilityHost do
         to raise_error(Vagrant::Errors::CapabilityHostNotDetected)
     end
 
+    it "passes on extra args to the detect method" do
+      klass = Class.new do
+        def detect?(*args)
+          raise "detect: #{args.inspect}"
+        end
+      end
+
+      hosts = {
+        foo: [klass, nil],
+      }
+
+      expect { subject.initialize_capabilities!(nil, hosts, {}, 1, 2) }.
+        to raise_error(RuntimeError, "detect: [1, 2]")
+    end
+
     it "detects a basic child" do
       hosts = {
         foo: [detect_class(false), nil],