diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index 901853d03a9cb..08ac1b3340d0c 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -174,7 +174,7 @@ def uninstall_flight_blocks?
     def install_time
       # <caskroom_path>/.metadata/<version>/<timestamp>/Casks/<token>.{rb,json} -> <timestamp>
       caskfile = installed_caskfile
-      caskfile ? Time.strptime(caskfile.dirname.dirname.basename.to_s, Metadata::TIMESTAMP_FORMAT) : nil
+      Time.strptime(caskfile.dirname.dirname.basename.to_s, Metadata::TIMESTAMP_FORMAT) if caskfile
     end
 
     sig { returns(T.nilable(Pathname)) }
diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index e94a8c2e317c2..00ca1e00d049b 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -154,7 +154,7 @@ def stale_formula?(pathname, scrub)
 
         stable = formula.stable
         if resource_name == "patch"
-          patch_hashes = stable&.patches&.filter_map { _1.resource.version if _1.external }
+          patch_hashes = stable&.patches&.filter_map { _1.resource.version if _1.external? }
           return true unless patch_hashes&.include?(Checksum.new(version.to_s))
         elsif resource_name && stable && (resource_version = stable.resources[resource_name]&.version)
           return true if resource_version != version