diff --git a/ports/mimxrt/mphalport.h b/ports/mimxrt/mphalport.h
index c4e5b052c9..4f1f4bfd12 100644
--- a/ports/mimxrt/mphalport.h
+++ b/ports/mimxrt/mphalport.h
@@ -41,9 +41,6 @@
 
 // For regular code that wants to prevent "background tasks" from running.
 // These background tasks (LWIP, Bluetooth) run in PENDSV context.
-// TODO: Check for the settings of the STM32 port in irq.h
-#define NVIC_PRIORITYGROUP_4    ((uint32_t)0x00000003)
-#define IRQ_PRI_PENDSV          NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
 #define MICROPY_PY_PENDSV_ENTER   uint32_t atomic_state = raise_irq_pri(IRQ_PRI_PENDSV);
 #define MICROPY_PY_PENDSV_REENTER atomic_state = raise_irq_pri(IRQ_PRI_PENDSV);
 #define MICROPY_PY_PENDSV_EXIT    restore_irq_pri(atomic_state);