diff --git a/Formula/sbcl.rb b/Formula/sbcl.rb
index 0b571dd27e..3e727ce24b 100644
--- a/Formula/sbcl.rb
+++ b/Formula/sbcl.rb
@@ -12,7 +12,6 @@ class Sbcl < Formula
     sha256 "94b9b75914e6b1b98f2adf21ea3bb409bf25922aa150026fa962ed3fbe7254b0" => :yosemite
   end
 
-  option "32-bit"
   option "with-internal-xref", "Include XREF information for SBCL internals (increases core size by 5-6MB)"
   option "with-ldb", "Include low-level debugger in the build"
   option "without-sources", "Don't install SBCL sources"
@@ -77,7 +76,7 @@ class Sbcl < Formula
       ascii_val =~ /[\x80-\xff]/n
     end
 
-    bootstrap = (build.build_32_bit? || !MacOS.prefer_64_bit?) ? "bootstrap32" : "bootstrap64"
+    bootstrap = MacOS.prefer_64_bit? ? "bootstrap64" : "bootstrap32"
     resource(bootstrap).stage do
       # We only need the binaries for bootstrapping, so don't install anything:
       command = "#{Dir.pwd}/src/runtime/sbcl"
@@ -85,7 +84,6 @@ class Sbcl < Formula
       xc_cmdline = "#{command} --core #{core} --disable-debugger --no-userinit --no-sysinit"
 
       cd buildpath do
-        ENV["SBCL_ARCH"] = "x86" if build.build_32_bit?
         Pathname.new("version.lisp-expr").write('"1.0.99.999"') if build.head?
         system "./make.sh", "--prefix=#{prefix}", "--xc-host=#{xc_cmdline}"
       end