diff --git a/test/acceptance/support/output.rb b/test/acceptance/support/output.rb
index 1e3bf1aaa..79fb292cf 100644
--- a/test/acceptance/support/output.rb
+++ b/test/acceptance/support/output.rb
@@ -2,6 +2,8 @@ module Acceptance
   # This class helps with matching against output so that every
   # test isn't inherently tied to the output format of Vagrant.
   class Output
+    DEFAULT_VM = "default"
+
     def initialize(text)
       @text = text
     end
@@ -63,8 +65,8 @@ module Acceptance
 
     # This checks that the "up" output properly contains text showing that
     # it is downloading the box during the up process.
-    def up_fetching_box(name)
-      @text =~ /Box #{name} was not found. Fetching box from specified URL...$/
+    def up_fetching_box(name, vm=DEFAULT_VM)
+      @text =~ /^[#{vm}] Box #{name} was not found. Fetching box from specified URL...$/
     end
   end
 end
diff --git a/test/acceptance/up_with_box_url.rb b/test/acceptance/up_with_box_url.rb
index cb3b78be7..37c3f962d 100644
--- a/test/acceptance/up_with_box_url.rb
+++ b/test/acceptance/up_with_box_url.rb
@@ -31,6 +31,10 @@ end
 VFILE
     end
 
+    # Bring up the environment, which should work. `machine1` should download
+    # the box while `machine2` doesn't.
     result = assert_execute("vagrant", "up")
+    result.stdout.should match_output(:up_fetching_box, "base", "machine1")
+    result.stdout.should_not match_output(:up_fetching_box, "base", "machine2")
   end
 end