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