diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index 96245f0223..461d711181 100755
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -108,14 +108,14 @@ class Build
     pre_superenv_hacks
     require 'superenv'
 
-    deps.each do |dep|
+    deps.map(&:to_formula).each do |dep|
       opt = HOMEBREW_PREFIX/:opt/dep
-      fixopt(dep.to_formula) unless opt.directory? or ARGV.ignore_deps?
+      fixopt(dep) unless opt.directory? or ARGV.ignore_deps?
     end
 
     if superenv?
       ENV.keg_only_deps = keg_only_deps.map(&:to_s)
-      ENV.deps = deps.map(&:to_s)
+      ENV.deps = deps.map { |d| d.to_formula.to_s }
       ENV.x11 = reqs.any? { |rq| rq.kind_of?(X11Dependency) }
       ENV.setup_build_environment
       post_superenv_hacks