diff --git a/reactos/drivers/usb/nt4compat/usbdriver/bulkonly.c b/reactos/drivers/usb/nt4compat/usbdriver/bulkonly.c
index 1e4674eb001..635865039ed 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/bulkonly.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/bulkonly.c
@@ -605,7 +605,7 @@ CHAR
 umss_bulkonly_get_maxlun(IN PUMSS_DEVICE_EXTENSION pdev_ext)
 {
     PURB purb = NULL;
-    CHAR max_lun;
+    UCHAR max_lun;
     NTSTATUS status;
 
     purb = usb_alloc_mem(NonPagedPool, sizeof(URB));
diff --git a/reactos/drivers/usb/nt4compat/usbdriver/devmgr.h b/reactos/drivers/usb/nt4compat/usbdriver/devmgr.h
index 448e0991495..625cb587c4b 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/devmgr.h
+++ b/reactos/drivers/usb/nt4compat/usbdriver/devmgr.h
@@ -42,7 +42,7 @@ typedef struct _USB_DRIVER_DESCRIPTION
 	BYTE if_protocol;							// Interface Protocol
 	
 	// Driver Info	
-	PBYTE driver_name;							// Driver name for Name Registry
+	const char *driver_name;					// Driver name for Name Registry
 	BYTE dev_class;								// Device Class (from SampleStorageDeviceID.h)
 	BYTE dev_sub_class;							// Device Subclass
 	BYTE dev_protocol;							// Protocol Info.
diff --git a/reactos/drivers/usb/nt4compat/usbdriver/gendrv.c b/reactos/drivers/usb/nt4compat/usbdriver/gendrv.c
index 7a6ae1214aa..8d0b1171c7a 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/gendrv.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/gendrv.c
@@ -1343,7 +1343,7 @@ gendrv_delete_device(PUSB_DEV_MANAGER dev_mgr, PDEVICE_OBJECT dev_obj)
     BOOLEAN is_if;
     PUSB_DRIVER pdrvr;
     PGENDRV_DEVICE_EXTENSION pdev_ext;
-    UCHAR dev_name[64];
+    CHAR dev_name[64];
     STRING string;
     UNICODE_STRING symb_link;
     PGENDRV_DRVR_EXTENSION pdrvr_ext;
@@ -1579,7 +1579,7 @@ gendrv_startio(IN PDEVICE_OBJECT dev_obj, IN PIRP irp)
     }
     else
     {
-        IoSetCancelRoutine(irp, NULL);
+        (void)IoSetCancelRoutine(irp, NULL);
     }
     IoReleaseCancelSpinLock(old_irql);
 
diff --git a/reactos/drivers/usb/nt4compat/usbdriver/umss.c b/reactos/drivers/usb/nt4compat/usbdriver/umss.c
index d3d64db4ce3..3a4d811e144 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/umss.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/umss.c
@@ -86,7 +86,7 @@ umss_create_port_device(PUSB_DEV_MANAGER dev_mgr, PUSB_DRIVER pdriver)
     // and upper driver use this to register itself
     // with umss driver for future notification of
     // pnp event. 2004-03-22 23:12:41
-    UCHAR dev_name[64];
+    CHAR dev_name[64];
     STRING string;
     NTSTATUS status;
     PDEVICE_OBJECT pdev;
@@ -136,7 +136,7 @@ umss_create_port_device(PUSB_DEV_MANAGER dev_mgr, PUSB_DRIVER pdriver)
 BOOLEAN
 umss_delete_port_device(PDEVICE_OBJECT dev_obj)
 {
-    UCHAR dev_name[64];
+    CHAR dev_name[64];
     STRING string;
     UNICODE_STRING symb_link;
 
@@ -305,7 +305,7 @@ PDEVICE_OBJECT
 umss_create_device(PUSB_DEV_MANAGER dev_mgr, PUSB_DRIVER umss_drvr, DEV_HANDLE dev_handle, BOOLEAN is_if)
 {
 
-    UCHAR dev_name[64], dev_id;
+    CHAR dev_name[64], dev_id;
     STRING string;
     NTSTATUS status;
     PDEVICE_OBJECT pdev;
@@ -708,7 +708,7 @@ umss_deferred_delete_device(PVOID context)
 BOOLEAN
 umss_delete_device(PUSB_DEV_MANAGER dev_mgr, PUSB_DRIVER pdrvr, PDEVICE_OBJECT dev_obj, BOOLEAN is_if)
 {
-    UCHAR dev_name[64];
+    CHAR dev_name[64];
     STRING string;
     UNICODE_STRING symb_link;
     PUMSS_DEVICE_EXTENSION pdev_ext;