diff --git a/Library/Homebrew/test/test_compilers.rb b/Library/Homebrew/test/test_compilers.rb
index dcc2332d48..bf9bc557ad 100644
--- a/Library/Homebrew/test/test_compilers.rb
+++ b/Library/Homebrew/test/test_compilers.rb
@@ -53,7 +53,7 @@ class CompilerTests < Test::Unit::TestCase
     assert !(f.fails_with? :clang)
     assert !(f.fails_with? :llvm)
     assert case MacOS.gcc_42_build_version
-      when 0 then f.fails_with? :gcc
+      when nil then f.fails_with? :gcc
       else !(f.fails_with? :gcc)
       end
 
@@ -95,7 +95,7 @@ class CompilerTests < Test::Unit::TestCase
     assert f.fails_with? :clang
     assert f.fails_with? :llvm
     assert case MacOS.gcc_42_build_version
-      when 0 then f.fails_with? :gcc
+      when nil then f.fails_with? :gcc
       else !(f.fails_with? :gcc)
       end