diff --git a/ports/zephyr/boards/mimxrt1050_evk.conf b/ports/zephyr/boards/mimxrt1050_evk.conf
index c4abf726a4..98981df75a 100644
--- a/ports/zephyr/boards/mimxrt1050_evk.conf
+++ b/ports/zephyr/boards/mimxrt1050_evk.conf
@@ -1,7 +1,6 @@
 # Required for zephyr.DiskAccess block devices
 CONFIG_DISK_ACCESS=y
 
-CONFIG_USB=y
 CONFIG_USB_DEVICE_STACK=y
 CONFIG_USB_DEVICE_PRODUCT="Zephyr MicroPython"
 CONFIG_USB_MASS_STORAGE=y
diff --git a/ports/zephyr/main.c b/ports/zephyr/main.c
index f972768340..1275a49739 100644
--- a/ports/zephyr/main.c
+++ b/ports/zephyr/main.c
@@ -34,7 +34,7 @@
 #include <net/net_context.h>
 #endif
 
-#ifdef CONFIG_USB
+#ifdef CONFIG_USB_DEVICE_STACK
 #include <usb/usb_device.h>
 #endif
 
@@ -140,7 +140,7 @@ soft_reset:
     #endif
     mp_init();
 
-    #ifdef CONFIG_USB
+    #ifdef CONFIG_USB_DEVICE_STACK
     usb_enable(NULL);
     #endif