diff --git a/bin/ocran b/bin/ocran
index 5fc3620..fb62e3a 100644
--- a/bin/ocran
+++ b/bin/ocran
@@ -64,17 +64,7 @@ module Ocran
       other = Pathname.new(other) unless other.is_a?(Pathname)
       return other if drive_letter?&.casecmp(other.drive_letter?) != 0
 
-      if absolute? != other.absolute?
-        raise ArgumentError, "both paths must be either absolute or relative"
-      end
-      a = to_s.split(Pathname::SEPARATOR_PAT)
-      b = other.to_s.split(Pathname::SEPARATOR_PAT)
-      while a.first && b.first && pathequal(a.first, b.first)
-        a.shift
-        b.shift
-      end
-      b.size.times { a.unshift ".." }
-      Pathname.new(File.join(*a))
+      super
     end
 
     # Determines if 'src' is contained in 'tgt' (i.e. it is a subpath of
@@ -111,8 +101,6 @@ module Ocran
     end
   end
 
-  ::Pathname.prepend(RefinePathname)
-
   IGNORE_MODULE_NAMES = /\A(enumerator.so|rational.so|complex.so|fiber.so|thread.rb|ruby2_keywords.rb)\z/
 
   GEM_SCRIPT_RE = /\.rbw?$/
@@ -634,6 +622,7 @@ EOF
   end
 
   def Ocran.build_exe
+    ::Pathname.prepend(RefinePathname)
     all_load_paths = $LOAD_PATH.map { |loadpath| Pathname(loadpath).expand_path }
     @added_load_paths = ($LOAD_PATH - @load_path_before).map { |loadpath| Pathname(loadpath).expand_path }
     working_directory = Pathname.pwd