diff --git a/Formula/gawk.rb b/Formula/gawk.rb
index ac68df3825..56a2ebcd64 100644
--- a/Formula/gawk.rb
+++ b/Formula/gawk.rb
@@ -1,15 +1,17 @@
 require 'formula'
 
 class Gawk < Formula
-  url 'http://ftp.gnu.org/gnu/gawk/gawk-3.1.8.tar.bz2'
+  url 'http://ftp.gnu.org/gnu/gawk/gawk-4.0.0.tar.bz2'
   homepage 'http://www.gnu.org/software/gawk/'
-  md5 '52b41c6c4418b3226dfb8f82076193bb'
+  md5 '7cdc48e99b885a4bbe0e98dcf1706b22'
 
   fails_with_llvm "Undefined symbols when linking", :build => "2326"
 
   def install
     system "./configure", "--prefix=#{prefix}"
     system "make"
+    ENV.j1 # Run tests serialized
+    system "make check"
     system "make install"
   end
 end