diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 5bad532b3bffde..04819a77a336f2 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -516,10 +516,9 @@ def uninstall(manual: false)
   end
 
   # True if the {#remote} of {Tap} is customized.
+  sig { returns(T::Boolean) }
   def custom_remote?
-    return true unless remote
-
-    remote.casecmp(default_remote).nonzero?
+    !remote&.casecmp(default_remote)&.zero?
   end
 
   # Path to the directory of all {Formula} files for this {Tap}.