diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index aaddb602a6ddc8..829dd2dcdc50b6 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -60,6 +60,11 @@ Homebrew/CompactBlank:
     # `blank?` is not necessarily available here:
     - "Homebrew/extend/enumerable.rb"
 
+Homebrew/NoFileutilsRmrf:
+  Include:
+    - "/**/{Formula,Casks}/**/*.rb"
+    - "**/{Formula,Casks}/**/*.rb"
+
 # only used internally
 Homebrew/MoveToExtendOS:
   Enabled: false
diff --git a/Library/Homebrew/rubocops/no_fileutils_rmrf.rb b/Library/Homebrew/rubocops/no_fileutils_rmrf.rb
index a99c9c5452e296..ed234c96992b9c 100644
--- a/Library/Homebrew/rubocops/no_fileutils_rmrf.rb
+++ b/Library/Homebrew/rubocops/no_fileutils_rmrf.rb
@@ -9,15 +9,14 @@ module Homebrew
       class NoFileutilsRmrf < Base
         extend AutoCorrector
 
-        MSG = "Use `FileUtils.rm` or `FileUtils.rm_r` instead of `FileUtils.rm_rf`, `FileUtils.rm_f`, " \
-              "or `{FileUtils,Pathname}.rmtree`."
+        MSG = "Use `rm` or `rm_r` instead of `rm_rf`, `rm_f`, or `rmtree`."
 
-        def_node_matcher :fileutils_rm_r_f?, <<~PATTERN
-          (send (const {nil? cbase} :FileUtils) {:rm_rf :rm_f :rmtree} ...)
+        def_node_matcher :self_rm_r_f_tree?, <<~PATTERN
+          (send (self) {:rm_rf :rm_f :rmtree} ...)
         PATTERN
 
-        def_node_matcher :pathname_rmtree?, <<~PATTERN
-          (send (const {nil? cbase} :Pathname) :rmtree ...)
+        def_node_matcher :plain_rm_r_f_tree?, <<~PATTERN
+          (send nil? {:rm_rf :rm_f :rmtree} ...)
         PATTERN
 
         def on_send(node)
@@ -30,12 +29,12 @@ def on_send(node)
               "rm"
             end
 
-            corrector.replace(node.loc.expression, "FileUtils.#{new_method}(#{node.arguments.first.source})")
+            corrector.replace(node.loc.expression, "#{new_method}(#{node.arguments.first.source})")
           end
         end
 
         def neither_rm_rf_nor_rmtree?(node)
-          !fileutils_rm_r_f?(node) && !pathname_rmtree?(node)
+          !self_rm_r_f_tree?(node) && !plain_rm_r_f_tree?(node)
         end
       end
     end
diff --git a/Library/Homebrew/test/rubocops/no_fileutils_rmrf_spec.rb b/Library/Homebrew/test/rubocops/no_fileutils_rmrf_spec.rb
index 4581fb2dbba70d..749808ccbd8ab9 100644
--- a/Library/Homebrew/test/rubocops/no_fileutils_rmrf_spec.rb
+++ b/Library/Homebrew/test/rubocops/no_fileutils_rmrf_spec.rb
@@ -5,78 +5,59 @@
 RSpec.describe RuboCop::Cop::Homebrew::NoFileutilsRmrf do
   subject(:cop) { described_class.new }
 
-  describe "FileUtils.rm_rf" do
+  describe "rm_rf" do
     it "registers an offense" do
       expect_offense(<<~RUBY)
-        FileUtils.rm_rf("path/to/directory")
-        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
+        rm_rf("path/to/directory")
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
       RUBY
     end
 
     it "autocorrects" do
       corrected = autocorrect_source(<<~RUBY)
-        FileUtils.rm_rf("path/to/directory")
+        rm_rf("path/to/directory")
       RUBY
 
       expect(corrected).to eq(<<~RUBY)
-        FileUtils.rm_r("path/to/directory")
+        rm_r("path/to/directory")
       RUBY
     end
   end
 
-  describe "FileUtils.rm_f" do
+  describe "rm_f" do
     it "registers an offense" do
       expect_offense(<<~RUBY)
-        FileUtils.rm_f("path/to/directory")
-        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
+        rm_f("path/to/directory")
+        ^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
       RUBY
     end
 
     it "autocorrects" do
       corrected = autocorrect_source(<<~RUBY)
-        FileUtils.rm_f("path/to/directory")
+        rm_f("path/to/directory")
       RUBY
 
       expect(corrected).to eq(<<~RUBY)
-        FileUtils.rm("path/to/directory")
+        rm("path/to/directory")
       RUBY
     end
   end
 
-  describe "FileUtils.rmtree" do
+  describe "rmtree" do
     it "registers an offense" do
       expect_offense(<<~RUBY)
-        FileUtils.rmtree("path/to/directory")
-        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
+        rmtree("path/to/directory")
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
       RUBY
     end
 
     it "autocorrects" do
       corrected = autocorrect_source(<<~RUBY)
-        FileUtils.rmtree("path/to/directory")
+        rmtree("path/to/directory")
       RUBY
 
       expect(corrected).to eq(<<~RUBY)
-        FileUtils.rm_r("path/to/directory")
-      RUBY
-    end
-  end
-
-  describe "Pathname.rmtree" do
-    it "registers an offense" do
-      expect_offense(<<~RUBY)
-        Pathname.rmtree("path/to/directory")
-        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
-      RUBY
-    end
-
-    it "autocorrects" do
-      corrected = autocorrect_source(<<~RUBY)
-        Pathname.rmtree("path/to/directory")
-      RUBY
-
-      expect(corrected).to eq(<<~RUBY)
-        FileUtils.rm_r("path/to/directory")
+        rm_r("path/to/directory")
       RUBY
     end
   end