diff --git a/targets/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c b/targets/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c
index 2c2aa417ff..385721cc0b 100644
--- a/targets/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c
+++ b/targets/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c
@@ -117,6 +117,8 @@ int trx_eth_start(openair0_device *device) {
 
     /* adjust MTU wrt number of samples per packet */
     //if(ethernet_tune (device,MTU_SIZE,UDP_IF4p5_PRACH_SIZE_BYTES)!=0)  return -1;
+    if(ethernet_tune (device,MTU_SIZE,1500)!=0)  return -1;
+