diff --git a/Formula/cucumber-cpp.rb b/Formula/cucumber-cpp.rb
index a0acddb95885..cc61356c0a4a 100644
--- a/Formula/cucumber-cpp.rb
+++ b/Formula/cucumber-cpp.rb
@@ -30,6 +30,10 @@ def install
   test do
     ENV["GEM_HOME"] = testpath
     ENV["BUNDLE_PATH"] = testpath
+    if MacOS.version == :high_sierra
+      ENV.delete("CPATH")
+      ENV.delete("SDKROOT")
+    end
     system "gem", "install", "cucumber", "-v", "3.0.0"
 
     (testpath/"features/test.feature").write <<~EOS