diff --git a/spec/homebrew/commands/list_spec.rb b/spec/homebrew/commands/list_spec.rb
index 4dc550bf0..3d250903e 100644
--- a/spec/homebrew/commands/list_spec.rb
+++ b/spec/homebrew/commands/list_spec.rb
@@ -21,7 +21,7 @@
 
     it "succeeds with list" do
       out = "<BOLD>Name    Status       User File<RESET>\nservice <GREEN>started<RESET> user /dev/null\n"
-      formula = OpenStruct.new(name: "service", user: "user", status: :started, file: +"/dev/null", loaded: true)
+      formula = OpenStruct.new(name: "service", user: "user", status: :started, file: +File::NULL, loaded: true)
       expect(Service::Formulae).to receive(:services_list).and_return([formula])
       expect do
         described_class.run
diff --git a/spec/homebrew/formula_wrapper_spec.rb b/spec/homebrew/formula_wrapper_spec.rb
index 0f7901477..ceefeac0b 100644
--- a/spec/homebrew/formula_wrapper_spec.rb
+++ b/spec/homebrew/formula_wrapper_spec.rb
@@ -139,7 +139,7 @@
 
     it "false if opt_prefix missing" do
       allow(service).to receive_messages(installed?:   true,
-                                         service_file: Pathname.new("/dev/null"),
+                                         service_file: Pathname.new(File::NULL),
                                          formula:      OpenStruct.new(plist:      nil,
                                                                       opt_prefix: Pathname.new("/dfslkfhjdsolshlk")))
       expect(service.plist?).to be(false)