diff --git a/Library/Homebrew/sandbox.rb b/Library/Homebrew/sandbox.rb
index 6da3dc18c2..8e5d9bd384 100644
--- a/Library/Homebrew/sandbox.rb
+++ b/Library/Homebrew/sandbox.rb
@@ -47,12 +47,12 @@ class Sandbox
   end
 
   def allow_cvs
-    allow_write_path "/Users/#{ENV["USER"]}/.cvspass"
+    allow_write_path "#{ENV["HOME"]}/.cvspass"
   end
 
   def allow_fossil
-    allow_write_path "/Users/#{ENV["USER"]}/.fossil"
-    allow_write_path "/Users/#{ENV["USER"]}/.fossil-journal"
+    allow_write_path "#{ENV["HOME"]}/.fossil"
+    allow_write_path "#{ENV["HOME"]}/.fossil-journal"
   end
 
   def allow_write_cellar(formula)
@@ -63,7 +63,7 @@ class Sandbox
 
   # Xcode projects expect access to certain cache/archive dirs.
   def allow_write_xcode
-    allow_write_path "/Users/#{ENV["USER"]}/Library/Developer"
+    allow_write_path "#{ENV["HOME"]}/Library/Developer"
   end
 
   def allow_write_log(formula)