diff --git a/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb b/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb
index 1cd2efbff..aafb1e396 100644
--- a/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb
+++ b/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb
@@ -270,7 +270,7 @@ module Vagrant
           else
             # Do a regular check
             if test_host_ip == "0.0.0.0" || Addrinfo.ip(test_host_ip).ipv4_loopback? ||
-                ipv4_interfaces.detect { |iface| iface[1] == test_host_ip }
+                Vagrant::Util::IPv4Interfaces.ipv4_interfaces.detect { |iface| iface[1] == test_host_ip }
               Vagrant::Util::IsPortOpen.is_port_open?(test_host_ip, host_port)
             else
               raise Errors::ForwardPortHostIPNotFound, name: machine.name, host_ip: host_ip
diff --git a/test/unit/vagrant/action/builtin/handle_forwarded_port_collisions_test.rb b/test/unit/vagrant/action/builtin/handle_forwarded_port_collisions_test.rb
index 98937f040..151c27202 100644
--- a/test/unit/vagrant/action/builtin/handle_forwarded_port_collisions_test.rb
+++ b/test/unit/vagrant/action/builtin/handle_forwarded_port_collisions_test.rb
@@ -209,7 +209,7 @@ describe Vagrant::Action::Builtin::HandleForwardedPortCollisions do
       let (:host_ip) { "127.1.2.40" }
 
       it "should check if the port is open" do
-        expect(instance).to receive(:is_port_open?).with(host_ip, host_port).and_return(true)
+        expect(Vagrant::Util::IsPortOpen).to receive(:is_port_open?).with(host_ip, host_port).and_return(true)
         instance.send(:port_check, host_ip, host_port)
       end
     end