diff --git a/Library/Homebrew/rubocops/patches.rb b/Library/Homebrew/rubocops/patches.rb
index ca18284891..79ffc873c6 100644
--- a/Library/Homebrew/rubocops/patches.rb
+++ b/Library/Homebrew/rubocops/patches.rb
@@ -56,12 +56,11 @@ module RuboCop
             problem "GitHub patches should end with .patch, not .diff: #{patch_url}"
           end
 
-          # TODO: Uncomment once offenses have been fixed in Homebrew/homebrew-core and Homebrew/linuxbrew-core
           # Only .diff passes `--full-index` to `git diff` and there is no documented way
           # to get .patch to behave the same for GitLab.
-          # if regex_match_group(patch_url_node, %r{.*gitlab.*/commit/[a-fA-F0-9]*\.patch})
-          #   problem "GitLab patches should end with .diff, not .patch: #{patch_url}"
-          # end
+          if regex_match_group(patch_url_node, %r{.*gitlab.*/commit/[a-fA-F0-9]*\.patch})
+            problem "GitLab patches should end with .diff, not .patch: #{patch_url}"
+          end
 
           gh_patch_param_pattern = %r{https?://github\.com/.+/.+/(?:commit|pull)/[a-fA-F0-9]*.(?:patch|diff)}
           if regex_match_group(patch_url_node, gh_patch_param_pattern) && !patch_url.match?(/\?full_index=\w+$/)
diff --git a/Library/Homebrew/test/rubocops/patches_spec.rb b/Library/Homebrew/test/rubocops/patches_spec.rb
index 4eafb91412..1631d076df 100644
--- a/Library/Homebrew/test/rubocops/patches_spec.rb
+++ b/Library/Homebrew/test/rubocops/patches_spec.rb
@@ -181,8 +181,7 @@ describe RuboCop::Cop::FormulaAudit::Patches do
         "https://github.com/uber/h3/pull/362.patch?full_index=1",
         "https://gitlab.gnome.org/GNOME/gitg/-/merge_requests/142.diff",
         "https://github.com/michaeldv/pit/commit/f64978d.diff?full_index=1",
-        # TODO: Uncomment once the corresponding check is re-enabled
-        # "https://gitlab.gnome.org/GNOME/msitools/commit/248450a.patch",
+        "https://gitlab.gnome.org/GNOME/msitools/commit/248450a.patch",
       ]
       patch_urls.each do |patch_url|
         source = <<~RUBY
@@ -224,11 +223,10 @@ describe RuboCop::Cop::FormulaAudit::Patches do
           expect_offense_hash message: <<~EOS.chomp, severity: :convention, line: 5, column: 8, source: source
             GitHub patches should end with .patch, not .diff: #{patch_url}
           EOS
-        # TODO: Uncomment once the corresponding check is re-enabled
-        # elsif patch_url.match?(%r{.*gitlab.*/commit/})
-        #   expect_offense_hash message: <<~EOS.chomp, severity: :convention, line: 5, column: 8, source: source
-        #     GitLab patches should end with .diff, not .patch: #{patch_url}
-        #   EOS
+        elsif patch_url.match?(%r{.*gitlab.*/commit/})
+          expect_offense_hash message: <<~EOS.chomp, severity: :convention, line: 5, column: 8, source: source
+            GitLab patches should end with .diff, not .patch: #{patch_url}
+          EOS
         # rubocop:disable Layout/LineLength
         elsif patch_url.match?(%r{https?://patch-diff\.githubusercontent\.com/raw/(.+)/(.+)/pull/(.+)\.(?:diff|patch)})
           # rubocop:enable Layout/LineLength