diff --git a/os/hal/ports/STM32/LLD/MACv2/hal_mac_lld.c b/os/hal/ports/STM32/LLD/MACv2/hal_mac_lld.c
index 1be6a6e4f9..8af6a429c2 100644
--- a/os/hal/ports/STM32/LLD/MACv2/hal_mac_lld.c
+++ b/os/hal/ports/STM32/LLD/MACv2/hal_mac_lld.c
@@ -279,10 +279,24 @@ OSAL_IRQ_HANDLER(STM32_ETH_HANDLER) {
 bool mac_lld_init(void) {
   unsigned i;
 
-  if (__eth_rb == NULL || __eth_tb == NULL || __eth_rd == NULL || __eth_td == NULL) {
+#if defined(STM32_ETH_BUFFERS_EXTERN)
+  if (__eth_rd == NULL || __eth_td == NULL) {
     return false;
   }
 
+  for (i = 0; i < STM32_MAC_RECEIVE_BUFFERS; i++) {
+    if (__eth_rb[i] == NULL) {
+      return false;
+    }
+  }
+
+  for (i = 0; i < STM32_MAC_TRANSMIT_BUFFERS; i++) {
+    if (__eth_tb[i] == NULL) {
+      return false;
+    }
+  }
+#endif
+
   macObjectInit(&ETHD1);
   ETHD1.link_up = false;