diff --git a/reactos/drivers/bus/acpi/cmbatt/cmexec.c b/reactos/drivers/bus/acpi/cmbatt/cmexec.c
index e4b3297a9be..beb646ab509 100644
--- a/reactos/drivers/bus/acpi/cmbatt/cmexec.c
+++ b/reactos/drivers/bus/acpi/cmbatt/cmexec.c
@@ -150,7 +150,7 @@ CmBattSendDownStreamIrp(IN PDEVICE_OBJECT DeviceObject,
 
 NTSTATUS
 NTAPI
-CmBattGetPsrData(INP DEVICE_OBJECT DeviceObject,
+CmBattGetPsrData(IN PDEVICE_OBJECT DeviceObject,
                  OUT PULONG PsrData)
 {
     NTSTATUS Status;