diff --git a/drivers/acpi/utilities/utcopy.c b/drivers/acpi/utilities/utcopy.c
index 879eaa1..ef28e19 100644
--- a/drivers/acpi/utilities/utcopy.c
+++ b/drivers/acpi/utilities/utcopy.c
@@ -502,6 +502,10 @@ acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
 			    external_object->buffer.length);
 
 		internal_object->buffer.length = external_object->buffer.length;
+
+		/* Mark buffer data valid */
+
+		internal_object->buffer.flags |= AOPOBJ_DATA_VALID;
 		break;
 
 	case ACPI_TYPE_INTEGER: