diff --git a/src/mainboard/lenovo/x201/acpi/platform.asl b/src/mainboard/lenovo/x201/acpi/platform.asl
index 7d7013bcd3..167fe03d9b 100644
--- a/src/mainboard/lenovo/x201/acpi/platform.asl
+++ b/src/mainboard/lenovo/x201/acpi/platform.asl
@@ -14,10 +14,6 @@
  * GNU General Public License for more details.
  */
 
-/* These come from the dynamically created CPU SSDT */
-External(PDC0)
-External(PDC1)
-
 /* The APM port can be used for generating software SMIs */
 
 OperationRegion (APMP, SystemIO, 0xb2, 2)
diff --git a/src/mainboard/packardbell/ms2290/acpi/platform.asl b/src/mainboard/packardbell/ms2290/acpi/platform.asl
index 9812d14bac..21d81152e0 100644
--- a/src/mainboard/packardbell/ms2290/acpi/platform.asl
+++ b/src/mainboard/packardbell/ms2290/acpi/platform.asl
@@ -14,10 +14,6 @@
  * GNU General Public License for more details.
  */
 
-/* These come from the dynamically created CPU SSDT */
-External(PDC0)
-External(PDC1)
-
 /* The APM port can be used for generating software SMIs */
 
 OperationRegion (APMP, SystemIO, 0xb2, 2)