diff --git a/Library/Homebrew/development_tools.rb b/Library/Homebrew/development_tools.rb
index 461f47f872..14fd4388ec 100644
--- a/Library/Homebrew/development_tools.rb
+++ b/Library/Homebrew/development_tools.rb
@@ -100,10 +100,9 @@ class DevelopmentTools
 
     def build_system_info
       {
-        "os"                => ENV["HOMEBREW_SYSTEM"],
-        "os_version"        => OS_VERSION,
-        "cpu_family"        => Hardware::CPU.family,
-        "oldest_cpu_family" => Hardware.oldest_cpu,
+        "os"         => ENV["HOMEBREW_SYSTEM"],
+        "os_version" => OS_VERSION,
+        "cpu_family" => Hardware::CPU.family,
       }
     end
     alias generic_build_system_info build_system_info
diff --git a/Library/Homebrew/extend/os/linux/development_tools.rb b/Library/Homebrew/extend/os/linux/development_tools.rb
index 6eae62b62d..6ad96f7982 100644
--- a/Library/Homebrew/extend/os/linux/development_tools.rb
+++ b/Library/Homebrew/extend/os/linux/development_tools.rb
@@ -21,7 +21,10 @@ class DevelopmentTools
     end
 
     def build_system_info
-      generic_build_system_info.merge "glibc_version" => OS::Linux::Glibc.version
+      generic_build_system_info.merge({
+        "glibc_version"     => OS::Linux::Glibc.version,
+        "oldest_cpu_family" => Hardware.oldest_cpu,
+      })
     end
   end
 end