diff --git a/ports/mimxrt/eth.c b/ports/mimxrt/eth.c
index 08e4dcc09d..288aafb6b3 100644
--- a/ports/mimxrt/eth.c
+++ b/ports/mimxrt/eth.c
@@ -291,6 +291,7 @@ void eth_init(eth_t *self, int mac_idx, const phy_operations_t *phy_ops, int phy
 
     ENET_Init(ENET, &g_handle, &enet_config, &buffConfig[0], hw_addr, CLOCK_GetFreq(kCLOCK_IpgClk));
     ENET_SetCallback(&g_handle, eth_irq_handler, (void *)self);
+    NVIC_SetPriority(ENET_IRQn, IRQ_PRI_PENDSV);
     ENET_EnableInterrupts(ENET, ENET_RX_INTERRUPT);
     ENET_ClearInterruptStatus(ENET, ENET_TX_INTERRUPT | ENET_RX_INTERRUPT | ENET_ERR_INTERRUPT);
     ENET_ActiveRead(ENET);
@@ -348,7 +349,7 @@ STATIC err_t eth_netif_output(struct netif *netif, struct pbuf *p) {
             p = p->next;
         }
         status = eth_send_frame_blocking(ENET, &g_handle, tx_frame, length);
-     }
+    }
     return status == kStatus_Success ? ERR_OK : ERR_BUF;
 }
 
diff --git a/ports/mimxrt/mpconfigport.h b/ports/mimxrt/mpconfigport.h
index 4462a18a61..7958874447 100644
--- a/ports/mimxrt/mpconfigport.h
+++ b/ports/mimxrt/mpconfigport.h
@@ -169,9 +169,11 @@ uint32_t trng_random_u32(void);
 // 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 MICROPY_PY_PENDSV_ENTER   uint32_t atomic_state = disable_irq();
-#define MICROPY_PY_PENDSV_REENTER atomic_state = disable_irq();
-#define MICROPY_PY_PENDSV_EXIT    enable_irq(atomic_state);
+#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);
 
 // Use VfsLfs2's types for fileio/textio
 #define mp_type_fileio mp_type_vfs_lfs2_fileio