diff --git a/include/acpi/acnames.h b/include/acpi/acnames.h
index f97804bdf1ff93a8d1923bc4fe75b6abc36e097d..7461327e14e43ade9065e56b9dab955a33970f3c 100644
--- a/include/acpi/acnames.h
+++ b/include/acpi/acnames.h
@@ -52,6 +52,7 @@
 #define METHOD_NAME__CBA        "_CBA"
 #define METHOD_NAME__CID        "_CID"
 #define METHOD_NAME__CRS        "_CRS"
+#define METHOD_NAME__DDN        "_DDN"
 #define METHOD_NAME__HID        "_HID"
 #define METHOD_NAME__INI        "_INI"
 #define METHOD_NAME__PLD        "_PLD"