diff --git a/Library/Homebrew/rubocops/checksum.rb b/Library/Homebrew/rubocops/checksum.rb
index daeab70415..e8035b8ee3 100644
--- a/Library/Homebrew/rubocops/checksum.rb
+++ b/Library/Homebrew/rubocops/checksum.rb
@@ -38,7 +38,7 @@ module RuboCop
 
           return unless regex_match_group(checksum, /[^a-f0-9]+/i)
 
-          problem "sha256 contains invalid characters"
+          add_offense(@offensive_source_range, message: "sha256 contains invalid characters")
         end
       end
 
@@ -46,6 +46,8 @@ module RuboCop
       #
       # @api private
       class ChecksumCase < FormulaCop
+        extend AutoCorrector
+
         def audit_formula(_node, _class_node, _parent_class_node, body_node)
           return if body_node.nil?
 
@@ -55,15 +57,11 @@ module RuboCop
             next if checksum.nil?
             next unless regex_match_group(checksum, /[A-F]+/)
 
-            problem "sha256 should be lowercase"
-          end
-        end
-
-        def autocorrect(node)
-          lambda do |corrector|
-            correction = node.source.downcase
-            corrector.insert_before(node.source_range, correction)
-            corrector.remove(node.source_range)
+            add_offense(@offensive_source_range, message: "sha256 should be lowercase") do |corrector|
+              correction = @offensive_node.source.downcase
+              corrector.insert_before(@offensive_node.source_range, correction)
+              corrector.remove(@offensive_node.source_range)
+            end
           end
         end
       end
diff --git a/Library/Homebrew/rubocops/shared/helper_functions.rb b/Library/Homebrew/rubocops/shared/helper_functions.rb
index a2270efa47..c9330051d2 100644
--- a/Library/Homebrew/rubocops/shared/helper_functions.rb
+++ b/Library/Homebrew/rubocops/shared/helper_functions.rb
@@ -29,6 +29,7 @@ module RuboCop
         @line_no = line_number(node)
         @source_buf = source_buffer(node)
         @offensive_node = node
+        @offensive_source_range = source_range(@source_buf, @line_no, @column, @length)
         match_object
       end
 
diff --git a/Library/Homebrew/test/rubocops/checksum_spec.rb b/Library/Homebrew/test/rubocops/checksum_spec.rb
index 4546c4f37a..0372161d7e 100644
--- a/Library/Homebrew/test/rubocops/checksum_spec.rb
+++ b/Library/Homebrew/test/rubocops/checksum_spec.rb
@@ -33,12 +33,12 @@ describe RuboCop::Cop::FormulaAudit::Checksum do
           stable do
             url "https://github.com/foo-lang/foo-compiler/archive/0.18.0.tar.gz"
             sha256 "5cf6e1ae0a645b426c0474cc7cd3f7d1605ffa1ac5756a39a8b2268ddc7ea0e9ad"
-                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sha256 should be 64 characters
+                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sha256 should be 64 characters
 
             resource "foo-package" do
               url "https://github.com/foo-lang/foo-package/archive/0.18.0.tar.gz"
               sha256 "5cf6e1ae0a645b426c047aaa4cc7cd3f7d1605ffa1ac5756a39a8b2268ddc7ea0e9"
-                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sha256 should be 64 characters
+                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sha256 should be 64 characters
             end
           end
         end
@@ -89,7 +89,7 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
       RUBY
     end
 
-    it "reports an offense if a checksum outside a `stable` block contains uppercase letters" do
+    it "reports and corrects an offense if a checksum outside a `stable` block contains uppercase letters" do
       expect_offense(<<~RUBY)
         class Foo < Formula
           url 'https://brew.sh/foo-1.0.tgz'
@@ -109,27 +109,14 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
           end
         end
       RUBY
-    end
 
-    it "auto-corrects checksums that contain uppercase letters" do
-      source = <<~RUBY
+      expect_correction(<<~RUBY)
         class Foo < Formula
           url 'https://brew.sh/foo-1.0.tgz'
-          stable do
-            url "https://github.com/foo-lang/foo-compiler/archive/0.18.0.tar.gz"
-            sha256 "5cf6e1ae0A645b426c0a7cc7cd3f7d1605ffa1ac5756a39a8b2268ddc7ea0e9a"
-
-            resource "foo-package" do
-              url "https://github.com/foo-lang/foo-package/archive/0.18.0.tar.gz"
-              sha256 "5cf6e1Ae0a645b426b047aa4cc7cd3f7d1605ffa1ac5756a39a8b2268ddc7ea9"
-            end
+          resource "foo-outside" do
+            url "https://github.com/foo-lang/foo-outside/archive/0.18.0.tar.gz"
+            sha256 "a4cc7cd3f7d1605ffa1ac5755cf6e1ae0a645b426b047a6a39a8b2268ddc7ea9"
           end
-        end
-      RUBY
-
-      corrected_source = <<~RUBY
-        class Foo < Formula
-          url 'https://brew.sh/foo-1.0.tgz'
           stable do
             url "https://github.com/foo-lang/foo-compiler/archive/0.18.0.tar.gz"
             sha256 "5cf6e1ae0a645b426c0a7cc7cd3f7d1605ffa1ac5756a39a8b2268ddc7ea0e9a"
@@ -141,9 +128,6 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
           end
         end
       RUBY
-
-      new_source = autocorrect_source(source)
-      expect(new_source).to eq(corrected_source)
     end
   end
 end