diff --git a/drivers/acpi/acpica/exconcat.c b/drivers/acpi/acpica/exconcat.c
index 2423fe0..5429c2a 100644
--- a/drivers/acpi/acpica/exconcat.c
+++ b/drivers/acpi/acpica/exconcat.c
@@ -156,7 +156,7 @@
 
 		status =
 		    acpi_ex_convert_to_integer(local_operand1, &temp_operand1,
-					       16);
+					       ACPI_STRTOUL_BASE16);
 		break;
 
 	case ACPI_TYPE_BUFFER: