diff --git a/spec/runtime/env_helpers_spec.rb b/spec/runtime/env_helpers_spec.rb
index c4ebdd1fd289..38f501e7cde6 100644
--- a/spec/runtime/env_helpers_spec.rb
+++ b/spec/runtime/env_helpers_spec.rb
@@ -21,7 +21,7 @@ def run_bundler_script(env, script)
       create_file("source.rb", <<-RUBY)
         print Bundler.original_env["PATH"]
       RUBY
-      path = `getconf PATH`.strip + "#{File::PATH_SEPARATOR}/foo"
+      path = default_system_path + "#{File::PATH_SEPARATOR}/foo"
       with_path_as(path) do
         bundle_exec_ruby(bundled_app("source.rb").to_s)
         expect(stdboth).to eq(path)
@@ -49,7 +49,7 @@ def run_bundler_script(env, script)
         end
         exec(Gem.ruby, __FILE__, (count - 1).to_s)
       RUBY
-      path = `getconf PATH`.strip + File::PATH_SEPARATOR + File.dirname(Gem.ruby)
+      path = default_system_path + File::PATH_SEPARATOR + File.dirname(Gem.ruby)
       with_path_as(path) do
         build_bundler_context
         bundle_exec_ruby("#{bundled_app("exe.rb")} 2")
diff --git a/spec/support/helpers.rb b/spec/support/helpers.rb
index 8798cca57bb5..7925663dd1d1 100644
--- a/spec/support/helpers.rb
+++ b/spec/support/helpers.rb
@@ -428,6 +428,12 @@ def with_gem_path_as(path)
       end
     end
 
+    # Windows has no `getconf`, and its current PATH holds the directories the
+    # Ruby under test finds its DLLs in, so keep it as is there.
+    def default_system_path
+      Gem.win_platform? ? ENV["PATH"] : `getconf PATH`.strip
+    end
+
     def with_path_as(path)
       without_env_side_effects do
         ENV["PATH"] = path.to_s