diff --git a/src/mainboard/google/brya/acpi/utility.asl b/src/mainboard/google/brya/acpi/utility.asl
index 9cdfb49c41..49f3dca8e9 100644
--- a/src/mainboard/google/brya/acpi/utility.asl
+++ b/src/mainboard/google/brya/acpi/utility.asl
@@ -37,3 +37,18 @@ Method (ITOB, 1)
 	Local0[3] = (Arg0 >> 24) & 0xFF
 	Return (Local0)
 }
+
+/* Convert from 64-bit integer to 8-byte buffer (little-endian) */
+Method (LTOB, 1)
+{
+	Local0 = Buffer(8) { 0, 0, 0, 0, 0, 0, 0, 0 }
+	Local0[0] = Arg0 & 0xFF
+	Local0[1] = (Arg0 >> 8) & 0xFF
+	Local0[2] = (Arg0 >> 16) & 0xFF
+	Local0[3] = (Arg0 >> 24) & 0xFF
+	Local0[4] = (Arg0 >> 32) & 0xFF
+	Local0[5] = (Arg0 >> 40) & 0xFF
+	Local0[6] = (Arg0 >> 48) & 0xFF
+	Local0[7] = (Arg0 >> 56) & 0xFF
+	Return (Local0)
+}