diff --git a/sys/conf/files b/sys/conf/files
index 8ccd10061bf6..14d18d9ecaec 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -422,6 +422,7 @@ dev/acpica/acpi_perf.c		optional acpi
 dev/acpica/acpi_powerres.c	optional acpi
 dev/acpica/acpi_quirk.c		optional acpi
 dev/acpica/acpi_resource.c	optional acpi
+dev/acpica/acpi_smbat.c		optional acpi
 dev/acpica/acpi_thermal.c	optional acpi
 dev/acpica/acpi_throttle.c	optional acpi
 dev/acpica/acpi_timer.c		optional acpi
diff --git a/sys/modules/acpi/acpi/Makefile b/sys/modules/acpi/acpi/Makefile
index 06cf146d4c92..dd302d8cc444 100644
--- a/sys/modules/acpi/acpi/Makefile
+++ b/sys/modules/acpi/acpi/Makefile
@@ -42,7 +42,7 @@ SRCS+=	acpi_timer.c acpi_pci_link.c acpi_thermal.c
 
 # ACPI hardware drivers, mostly used for mobile systems.
 SRCS+=	acpi_acad.c acpi_battery.c acpi_cmbat.c acpi_cpu.c
-SRCS+=	acpi_ec.c acpi_lid.c acpi_perf.c acpi_throttle.c
+SRCS+=	acpi_ec.c acpi_lid.c acpi_perf.c acpi_smbat.c acpi_throttle.c
 
 # OSD layer
 SRCS+=	OsdDebug.c