diff --git a/benchmarks/shipit/benchmark.rb b/benchmarks/shipit/benchmark.rb
index 607498d0..72ad3404 100644
--- a/benchmarks/shipit/benchmark.rb
+++ b/benchmarks/shipit/benchmark.rb
@@ -5,8 +5,25 @@
 ENV['SHIPIT_DISABLE_AUTH'] = '1' # Saves us lots of trouble
 
 Dir.chdir __dir__
+
 use_gemfile
 
+# sassc uses FFI with hardcoded paths to find its compiled libsass shared object.
+# RubyGems 4.x (Ruby 4.1+) no longer copies extensions into the gem's lib/ tree,
+# so sassc can't find it. Copy it into place.
+if RUBY_VERSION >= "4.1"
+  spec = Gem::Specification.find_by_name("sassc") rescue nil
+  if spec
+    dl_ext = RbConfig::MAKEFILE_CONFIG['DLEXT']
+    target = File.join(spec.gem_dir, "ext", "libsass.#{dl_ext}")
+    source = File.join(spec.extension_dir, "sassc", "libsass.#{dl_ext}")
+    if !File.exist?(target) && File.exist?(source)
+      require 'fileutils'
+      FileUtils.cp(source, target)
+    end
+  end
+end
+
 require 'securerandom'
 ENV['SECRET_KEY_BASE'] = SecureRandom.hex(128)