diff --git a/src/add-ons/kernel/drivers/network/ipro1000/device.c b/src/add-ons/kernel/drivers/network/ipro1000/device.c
index 2f085f7796..1f8ad3d7f6 100644
--- a/src/add-ons/kernel/drivers/network/ipro1000/device.c
+++ b/src/add-ons/kernel/drivers/network/ipro1000/device.c
@@ -370,7 +370,7 @@ ipro1000_control(void *cookie, uint32 op, void *arg, size_t len)
 
 		case ETHER_SET_LINK_STATE_SEM:
 		{
-			if (user_memcpy(&device->linkChangeSem, arg, sizeof(sem_id *)) < B_OK) {
+			if (user_memcpy(&device->linkChangeSem, arg, sizeof(sem_id)) < B_OK) {
 				device->linkChangeSem = -1;
 				return B_BAD_ADDRESS;
 			}
diff --git a/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp b/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
index 9960779e8c..757d425588 100644
--- a/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
+++ b/src/add-ons/kernel/network/devices/ethernet/ethernet.cpp
@@ -178,7 +178,7 @@ ethernet_up(net_device *_device)
 		// Set the change notification semaphore; doesn't matter
 		// if this is supported by the device or not
 		ioctl(device->fd, ETHER_SET_LINK_STATE_SEM, &sLinkChangeSemaphore,
-			sizeof(sem_id *));
+			sizeof(sem_id));
 
 		BenaphoreLocker _(&sListLock);