diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 6dcec05dd0..4e21a7c463 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -17,7 +17,7 @@ class Pathname
     if new_basename
       new_basename = File.basename(new_basename) # rationale: see Pathname.+
       dst = self+new_basename
-      return_value =Pathname.new(dst)
+      return_value = Pathname.new(dst)
     else
       dst = self
       return_value = self+File.basename(src)