diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index d5db8bc6e9..09086678a2 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -459,7 +459,7 @@ class MercurialDownloadStrategy < AbstractDownloadStrategy
   def cached_location; @clone; end
 
   def hgpath
-    @path ||= (which "hg" || "#{HOMEBREW_PREFIX}/bin/hg")
+    @path ||= (which("hg") || "#{HOMEBREW_PREFIX}/bin/hg")
   end
 
   def fetch