diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index 5fbfa9f69a..e1178d5dd2 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -246,7 +246,7 @@ class Keg < Pathname
         Find.prune if File.basename(src) == '.DS_Store'
         # Don't link pyc files because Python overwrites these cached object
         # files and next time brew wants to link, the pyc file is in the way.
-        if src.extname.to_s == '.pyc' && src.to_s =~ /site-packages/
+        if src.extname == '.pyc' && src.to_s =~ /site-packages/
           Find.prune
         end
 
@@ -274,7 +274,7 @@ class Keg < Pathname
         next if dst.directory? and not dst.symlink?
         # no need to put .app bundles in the path, the user can just use
         # spotlight, or the open command and actual mac apps use an equivalent
-        Find.prune if src.extname.to_s == '.app'
+        Find.prune if src.extname == '.app'
 
         case yield src.relative_path_from(root)
         when :skip_dir
diff --git a/Library/Homebrew/keg_fix_install_names.rb b/Library/Homebrew/keg_fix_install_names.rb
index 99726166c7..d382b2a3e9 100644
--- a/Library/Homebrew/keg_fix_install_names.rb
+++ b/Library/Homebrew/keg_fix_install_names.rb
@@ -175,7 +175,7 @@ class Keg
     pc_dir = self/'lib/pkgconfig'
     if pc_dir.directory?
       pc_dir.find do |pn|
-        next if pn.symlink? or pn.directory? or pn.extname.to_s != '.pc'
+        next if pn.symlink? or pn.directory? or pn.extname != '.pc'
         pkgconfig_files << pn
       end
     end
@@ -194,7 +194,7 @@ class Keg
     # find .la files, which are stored in lib/
     la_dir = self/'lib'
     la_dir.find do |pn|
-      next if pn.symlink? or pn.directory? or pn.extname.to_s != '.la'
+      next if pn.symlink? or pn.directory? or pn.extname != '.la'
       libtool_files << pn
     end
     libtool_files