diff --git a/Library/Homebrew/os/mac/keg.rb b/Library/Homebrew/os/mac/keg.rb
index 78dec6fbd3229..9e692e64b118a 100644
--- a/Library/Homebrew/os/mac/keg.rb
+++ b/Library/Homebrew/os/mac/keg.rb
@@ -36,7 +36,6 @@ def change_install_name(old, new, file)
     raise
   end
 
-  sig { params(old: Pathname, new: Pathname, file: MachOShim).returns(T::Boolean) }
   def change_rpath(old, new, file)
     return false if old == new