diff --git a/os/various/lwip_bindings/lwipthread.c b/os/various/lwip_bindings/lwipthread.c
index ee4303fcc..b2868c84d 100644
--- a/os/various/lwip_bindings/lwipthread.c
+++ b/os/various/lwip_bindings/lwipthread.c
@@ -104,7 +104,7 @@ static void low_level_init(struct netif *netif) {
 
   /* device capabilities */
   /* don't set NETIF_FLAG_ETHARP if this device is not an Ethernet one */
-  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
+  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
 
   /* Do whatever else is needed to initialize interface. */
 }
diff --git a/readme.txt b/readme.txt
index b5ad982a5..6100bbd93 100644
--- a/readme.txt
+++ b/readme.txt
@@ -76,6 +76,7 @@
 *** 20.3.5 ***
 - FIX: Some MISRA-related fixes.
 - FIX: Re-opened and fixed bug #1100.
+- FIX: Fixed invalid handling of lwIP NETIF_FLAG_LINK_UP flag (bug #1227).
 - FIX: Fixed missing TIM16/17 errata handling for STM32G0xx (bug #1226).
 - FIX: Fixed missing ADC errata handling for STM32G0xx (bug #1225).
 - FIX: Fixed problem in the HAL I2C fallback driver (bug #1224).