diff --git a/Library/Homebrew/test/compiler_failure_spec.rb b/Library/Homebrew/test/compiler_failure_spec.rb
index 2be605f4b9..f24c6f3536 100644
--- a/Library/Homebrew/test/compiler_failure_spec.rb
+++ b/Library/Homebrew/test/compiler_failure_spec.rb
@@ -9,31 +9,57 @@ describe CompilerFailure do
   describe "::create" do
     it "creates a failure when given a symbol" do
       failure = described_class.create(:clang)
-      expect(failure).to fail_with(double("Compiler", type: :clang, name: :clang, version: 600))
+      expect(failure).to fail_with(
+        instance_double(CompilerSelector::Compiler, "Compiler", type: :clang, name: :clang, version: 600),
+      )
     end
 
     it "can be given a build number in a block" do
       failure = described_class.create(:clang) { build 700 }
-      expect(failure).to fail_with(double("Compiler", type: :clang, name: :clang, version: 700))
+      expect(failure).to fail_with(
+        instance_double(CompilerSelector::Compiler, "Compiler", type: :clang, name: :clang, version: 700),
+      )
     end
 
     it "can be given an empty block" do
       failure = described_class.create(:clang) {}
-      expect(failure).to fail_with(double("Compiler", type: :clang, name: :clang, version: 600))
+      expect(failure).to fail_with(
+        instance_double(CompilerSelector::Compiler, "Compiler", type: :clang, name: :clang, version: 600),
+      )
     end
 
     it "creates a failure when given a hash" do
       failure = described_class.create(gcc: "7")
-      expect(failure).to fail_with(double("Compiler", type: :gcc, name: "gcc-7", version: Version.new("7")))
-      expect(failure).to fail_with(double("Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.1")))
-      expect(failure).not_to fail_with(double("Compiler", type: :gcc, name: "gcc-6", version: Version.new("6.0")))
+      expect(failure).to fail_with(
+        instance_double(CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-7", version: Version.new("7")),
+      )
+      expect(failure).to fail_with(
+        instance_double(
+          CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.1")
+        ),
+      )
+      expect(failure).not_to fail_with(
+        instance_double(
+          CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-6", version: Version.new("6.0")
+        ),
+      )
     end
 
     it "creates a failure when given a hash and a block with aversion" do
       failure = described_class.create(gcc: "7") { version "7.1" }
-      expect(failure).to fail_with(double("Compiler", type: :gcc, name: "gcc-7", version: Version.new("7")))
-      expect(failure).to fail_with(double("Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.1")))
-      expect(failure).not_to fail_with(double("Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.2")))
+      expect(failure).to fail_with(
+        instance_double(CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-7", version: Version.new("7")),
+      )
+      expect(failure).to fail_with(
+        instance_double(
+          CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.1")
+        ),
+      )
+      expect(failure).not_to fail_with(
+        instance_double(
+          CompilerSelector::Compiler, "Compiler", type: :gcc, name: "gcc-7", version: Version.new("7.2")
+        ),
+      )
     end
   end
 end