diff --git a/Library/Homebrew/test/cask/dsl_spec.rb b/Library/Homebrew/test/cask/dsl_spec.rb
index f2bfd2b1f6..1133b3ec15 100644
--- a/Library/Homebrew/test/cask/dsl_spec.rb
+++ b/Library/Homebrew/test/cask/dsl_spec.rb
@@ -335,11 +335,11 @@ describe Cask::DSL, :cask do
   end
 
   describe "depends_on macos" do
-    context "valid", :needs_compat do
+    context "string disabled", :needs_compat do
       let(:token) { "compat/with-depends-on-macos-string" }
 
       it "allows depends_on macos to be specified" do
-        expect(cask.depends_on.macos).not_to be nil
+        expect { cask }.to raise_error(Cask::CaskInvalidError)
       end
     end
 
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 7da63374ba..407567d890 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -144,6 +144,7 @@ RSpec.configure do |config|
     end
 
     begin
+      Homebrew.raise_deprecation_exceptions = true
       Tap.clear_cache
       FormulaInstaller.clear_attempted