diff --git a/src/southbridge/intel/common/acpi/platform.asl b/src/southbridge/intel/common/acpi/platform.asl
index b92872920c..2786d93ec5 100644
--- a/src/southbridge/intel/common/acpi/platform.asl
+++ b/src/southbridge/intel/common/acpi/platform.asl
@@ -47,16 +47,10 @@ Method(GOS, 0)
 	 *    OSYS value | Operating System
 	 *    -----------+------------------
 	 *       2000    | Windows 2000
-	 *       2001    | Windows XP
-	 *       2001    | Windows XP SP1
-	 *       2001    | Windows Server 2003
-	 *       2001    | Windows Server 2003 SP1
+	 *       2001    | Windows XP(+SP1)
 	 *       2002    | Windows XP SP2
 	 *       2006    | Windows Vista
-	 *       2006    | Windows Vista SP1
-	 *       2006    | Windows Server 2008
-	 *       2009    | Windows 7
-	 *       2012    | Windows 8
+	 *       ????    | Windows 7
 	 */
 
 	/* Let's assume we're running at least Windows 2000 */
@@ -71,14 +65,6 @@ Method(GOS, 0)
 			Store (2001, OSYS)
 		}
 
-		If (_OSI("Windows 2001.1")) {
-			Store (2001, OSYS)
-		}
-
-		If (_OSI("Windows 2001.1 SP1")) {
-			Store (2001, OSYS)
-		}
-
 		If (_OSI("Windows 2001 SP2")) {
 			Store (2002, OSYS)
 		}
@@ -86,21 +72,5 @@ Method(GOS, 0)
 		If (_OSI("Windows 2006")) {
 			Store (2006, OSYS)
 		}
-
-		If (_OSI("Windows 2006 SP1")) {
-			Store (2006, OSYS)
-		}
-
-		If (_OSI("Windows 2006.1")) {
-			Store (2006, OSYS)
-		}
-
-		If (_OSI("Windows 2009")) {
-			Store (2009, OSYS)
-		}
-
-		If (_OSI("Windows 2012")) {
-			Store (2012, OSYS)
-		}
 	}
 }