diff --git a/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp b/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
index 147a59877c..110b9ac2c9 100644
--- a/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
+++ b/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
@@ -400,7 +400,9 @@ ethernet_add_multicast(struct net_device *_device, const sockaddr *_address)
 	if (address->sdl_type != IFT_ETHER)
 		return B_BAD_VALUE;
 
-	return ioctl(device->fd, ETHER_ADDMULTI, LLADDR(address), 6);
+	if (ioctl(device->fd, ETHER_ADDMULTI, LLADDR(address), 6) < 0)
+		return errno;
+	return B_OK;
 }
 
 
@@ -416,7 +418,9 @@ ethernet_remove_multicast(struct net_device *_device, const sockaddr *_address)
 	if (address->sdl_type != IFT_ETHER)
 		return B_BAD_VALUE;
 
-	return ioctl(device->fd, ETHER_REMMULTI, LLADDR(address), 6);
+	if (ioctl(device->fd, ETHER_REMMULTI, LLADDR(address), 6) < 0)
+		return errno;
+	return B_OK;
 }