diff --git a/tests/usbus_hid/Makefile b/tests/usbus_hid/Makefile
index 92adda2678..399a2668a0 100644
--- a/tests/usbus_hid/Makefile
+++ b/tests/usbus_hid/Makefile
@@ -6,7 +6,7 @@ USEMODULE += usbus_hid
 
 DISABLE_MODULE += auto_init_usbus
 
-USB_VID ?= ${USB_VID_TESTING}
-USB_PID ?= ${USB_PID_TESTING}
+USB_VID ?= $(USB_VID_TESTING)
+USB_PID ?= $(USB_PID_TESTING)
 
 include $(RIOTBASE)/Makefile.include
diff --git a/tests/usbus_hid/main.c b/tests/usbus_hid/main.c
index 508390dcd7..42f262533e 100644
--- a/tests/usbus_hid/main.c
+++ b/tests/usbus_hid/main.c
@@ -24,62 +24,66 @@
 #include "usb/usbus/hid.h"
 
 /*
-this descriptor is used, because the basic usb_hid interface was developed in
-conjunction with FIDO2. Descriptor is taken from CTAP2 specification
-(version 20190130) section 8.1.8.2
-*/
+   this descriptor is used, because the basic usb_hid interface was developed in
+   conjunction with FIDO2. Descriptor is taken from CTAP2 specification
+   (version 20190130) section 8.1.8.2
+ */
 static uint8_t report_desc_ctap[] = {
-  0x06, 0xD0, 0xF1, /* HID_UsagePage ( FIDO_USAGE_PAGE ) */
-  0x09, 0x01,       /* HID_Usage ( FIDO_USAGE_CTAPHID ) */
-  0xA1, 0x01,       /* HID_Collection ( HID_Application ) */
-  0x09, 0x20,       /* HID_Usage ( FIDO_USAGE_DATA_IN ) */
-  0x15, 0x00,       /* HID_LogicalMin ( 0 ) */
-  0x26, 0xFF, 0x00, /* HID_LogicalMaxS ( 0xff ) */
-  0x75, 0x08,       /* HID_ReportSize ( 8 ) */
-  0x95, 0x40,       /* HID_ReportCount ( HID_INPUT_REPORT_BYTES ) */
-  0x81, 0x02,       /* HID_Input ( HID_Data | HID_Absolute | HID_Variable ) */
-  0x09, 0x21,       /* HID_Usage ( FIDO_USAGE_DATA_OUT ) */
-  0x15, 0x00,       /* HID_LogicalMin ( 0 ) */
-  0x26, 0xFF, 0x00, /* HID_LogicalMaxS ( 0xff ) */
-  0x75, 0x08,       /* HID_ReportSize ( 8 ) */
-  0x95, 0x40,       /* HID_ReportCount ( HID_OUTPUT_REPORT_BYTES ) */
-  0x91, 0x02,       /* HID_Output ( HID_Data | HID_Absolute | HID_Variable ) */
-  0xC0,             /* HID_EndCollection */
+    0x06, 0xD0, 0xF1,   /* HID_UsagePage ( FIDO_USAGE_PAGE ) */
+    0x09, 0x01,         /* HID_Usage ( FIDO_USAGE_CTAPHID ) */
+    0xA1, 0x01,         /* HID_Collection ( HID_Application ) */
+    0x09, 0x20,         /* HID_Usage ( FIDO_USAGE_DATA_IN ) */
+    0x15, 0x00,         /* HID_LogicalMin ( 0 ) */
+    0x26, 0xFF, 0x00,   /* HID_LogicalMaxS ( 0xff ) */
+    0x75, 0x08,         /* HID_ReportSize ( 8 ) */
+    0x95, 0x40,         /* HID_ReportCount ( HID_INPUT_REPORT_BYTES ) */
+    0x81, 0x02,         /* HID_Input ( HID_Data | HID_Absolute | HID_Variable ) */
+    0x09, 0x21,         /* HID_Usage ( FIDO_USAGE_DATA_OUT ) */
+    0x15, 0x00,         /* HID_LogicalMin ( 0 ) */
+    0x26, 0xFF, 0x00,   /* HID_LogicalMaxS ( 0xff ) */
+    0x75, 0x08,         /* HID_ReportSize ( 8 ) */
+    0x95, 0x40,         /* HID_ReportCount ( HID_OUTPUT_REPORT_BYTES ) */
+    0x91, 0x02,         /* HID_Output ( HID_Data | HID_Absolute | HID_Variable ) */
+    0xC0,               /* HID_EndCollection */
 };
 
 static usbus_t usbus;
 static char _stack[USBUS_STACKSIZE];
 
-void usb_hid_io_init(usbus_t* usbus, uint8_t* report_desc,
+void usb_hid_io_init(usbus_t *usbus, uint8_t *report_desc,
                      size_t report_desc_size);
-ssize_t usb_hid_io_read(void* buffer, size_t len);
+ssize_t usb_hid_io_read(void *buffer, size_t len);
 
 void init(void)
 {
-  usbdev_t *usbdev = usbdev_get_ctx(0);
-  usbus_init(&usbus, usbdev);
+    usbdev_t *usbdev = usbdev_get_ctx(0);
 
-  usb_hid_io_init(&usbus, report_desc_ctap, sizeof(report_desc_ctap));
+    usbus_init(&usbus, usbdev);
 
-  usbus_create(_stack, USBUS_STACKSIZE, USBUS_PRIO, USBUS_TNAME, &usbus);
+    usb_hid_io_init(&usbus, report_desc_ctap, sizeof(report_desc_ctap));
+
+    usbus_create(_stack, USBUS_STACKSIZE, USBUS_PRIO, USBUS_TNAME, &usbus);
 }
 
 int main(void)
 {
-  /* sleep to wait for Pyterm attaching in order to see puts messages */
-  xtimer_sleep(3);
-  init();
-  puts("RIOT USB HID echo test");
-  puts("Write input to the hidraw device under /dev/hidrawX, and see if it gets echoed here");
+    /* sleep to wait for Pyterm attaching in order to see puts messages */
+    xtimer_sleep(3);
+    init();
+    puts("RIOT USB HID echo test");
+    puts(
+        "Write input to the hidraw device under /dev/hidrawX, and see if it gets echoed here");
 
-  uint8_t buffer[CONFIG_USBUS_HID_INTERRUPT_EP_SIZE];
-  for (;;) {
-    ssize_t len = usb_hid_io_read(buffer, CONFIG_USBUS_HID_INTERRUPT_EP_SIZE);
+    uint8_t buffer[CONFIG_USBUS_HID_INTERRUPT_EP_SIZE];
 
-    printf("Msg received via USB HID: ");
-    for (int i = 0; i < len; i++)  {
-      putc(buffer[i], stdout);
+    for (;;) {
+        ssize_t len =
+            usb_hid_io_read(buffer, CONFIG_USBUS_HID_INTERRUPT_EP_SIZE);
+
+        printf("Msg received via USB HID: ");
+        for (int i = 0; i < len; i++) {
+            putc(buffer[i], stdout);
+        }
+        printf("\n");
     }
-    printf("\n");
-  }
 }