diff --git a/sys/dev/ena/ena.c b/sys/dev/ena/ena.c
index a806747d639..174549120d9 100644
--- a/sys/dev/ena/ena.c
+++ b/sys/dev/ena/ena.c
@@ -2368,6 +2368,8 @@ ena_ioctl(if_t ifp, u_long command, caddr_t data)
 	rc = 0;
 	switch (command) {
 	case SIOCSIFMTU:
+		if (ifp->if_mtu == ifr->ifr_mtu)
+			break;
 		sx_xlock(&adapter->ioctl_sx);
 		ena_down(adapter);