diff --git a/projects/rubygems.org/fit-n-finish.patch b/projects/rubygems.org/fit-n-finish.patch
index 8f951873..7cc82f46 100644
--- a/projects/rubygems.org/fit-n-finish.patch
+++ b/projects/rubygems.org/fit-n-finish.patch
@@ -173,12 +173,3 @@ index 8fef455..3ef4e30 100644
        @plugins_dir = Gem.plugindir(gem_home)
        check_that_user_bin_dir_is_in_path
      end
-@@ -955,7 +955,7 @@ def write_cache_file
-
-   def ensure_writable_dir(dir) # :nodoc:
-     begin
--      Dir.mkdir dir, *[options[:dir_mode] && 0755].compact
-+      FileUtils.mkdir_p dir, *[options[:dir_mode] && 0755].compact
-     rescue SystemCallError
-       raise unless File.directory? dir
-     end
diff --git a/projects/rubygems.org/package.yml b/projects/rubygems.org/package.yml
index f1aab29d..e31bc59b 100644
--- a/projects/rubygems.org/package.yml
+++ b/projects/rubygems.org/package.yml
@@ -30,6 +30,10 @@ build:
         patch -p1 < "$SRCROOT"/props/fit-n-finish.patch
         patch -p1 < "$SRCROOT"/props/fit-n-finish.2.patch
       working-directory: ${{prefix}}
+    - run: |
+        sed -i.bak -e 's/Dir\.mkdir dir, \*\[options\[:dir_mode\].*/FileUtils.mkdir_p dir, *[options[:dir_mode] \&\& 0o755].compact/' installer.rb
+        rm installer.rb.bak
+      working-directory: ${{prefix}}/lib/rubygems
 
     # these are provided by ruby-lang.org
     # we don’t know why they turn up here too…