diff --git a/src/org/jruby/libraries/RbConfigLibrary.java b/src/org/jruby/libraries/RbConfigLibrary.java
index 089a3060b38..dc9cd9fe6c5 100644
--- a/src/org/jruby/libraries/RbConfigLibrary.java
+++ b/src/org/jruby/libraries/RbConfigLibrary.java
@@ -78,7 +78,7 @@ public class RbConfigLibrary implements Library {
         RUBY_OS_NAMES.put("Windows 2003", RUBY_WIN32);
         RUBY_OS_NAMES.put("Windows Vista", RUBY_WIN32);
         RUBY_OS_NAMES.put("Windows 7", RUBY_WIN32);
-        RUBY_OS_NAMES.put("Windows 2008 Server", RUBY_WIN32);
+        RUBY_OS_NAMES.put("Windows Server 2008", RUBY_WIN32);
         RUBY_OS_NAMES.put("Solaris", RUBY_SOLARIS);
         RUBY_OS_NAMES.put("FreeBSD", RUBY_FREEBSD);
         RUBY_OS_NAMES.put("AIX", RUBY_AIX);