diff --git a/boards/sim/sim/sim/configs/libcxxtest/defconfig b/boards/sim/sim/sim/configs/libcxxtest/defconfig
index 74c295a6271..3336f7e2626 100644
--- a/boards/sim/sim/sim/configs/libcxxtest/defconfig
+++ b/boards/sim/sim/sim/configs/libcxxtest/defconfig
@@ -50,7 +50,6 @@ CONFIG_MAX_TASKS=64
 CONFIG_MM_FILL_ALLOCATIONS=y
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDEV_IFINDEX=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETDOWN_NOTIFIER=y
 CONFIG_NETINIT_DHCPC=y
diff --git a/boards/sim/sim/sim/configs/module32/defconfig b/boards/sim/sim/sim/configs/module32/defconfig
index 3d6d7cdb4f8..e724d6ab880 100644
--- a/boards/sim/sim/sim/configs/module32/defconfig
+++ b/boards/sim/sim/sim/configs/module32/defconfig
@@ -34,7 +34,6 @@ CONFIG_MM_FILL_ALLOCATIONS=y
 CONFIG_NAME_MAX=64
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDEV_IFINDEX=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETDOWN_NOTIFIER=y
 CONFIG_NET_ARP_SEND=y
diff --git a/boards/sim/sim/sim/configs/sotest/defconfig b/boards/sim/sim/sim/configs/sotest/defconfig
index b048653ce60..363d1a0b02d 100644
--- a/boards/sim/sim/sim/configs/sotest/defconfig
+++ b/boards/sim/sim/sim/configs/sotest/defconfig
@@ -34,7 +34,6 @@ CONFIG_MM_FILL_ALLOCATIONS=y
 CONFIG_NAME_MAX=64
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDEV_IFINDEX=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETDOWN_NOTIFIER=y
 CONFIG_NET_ARP_SEND=y
diff --git a/boards/sim/sim/sim/configs/sotest32/defconfig b/boards/sim/sim/sim/configs/sotest32/defconfig
index 9cbccccfdee..eb9136a6a7d 100644
--- a/boards/sim/sim/sim/configs/sotest32/defconfig
+++ b/boards/sim/sim/sim/configs/sotest32/defconfig
@@ -34,7 +34,6 @@ CONFIG_MM_FILL_ALLOCATIONS=y
 CONFIG_NAME_MAX=64
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDEV_IFINDEX=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETDOWN_NOTIFIER=y
 CONFIG_NET_ARP_SEND=y
diff --git a/boards/sim/sim/sim/configs/vpnkit/defconfig b/boards/sim/sim/sim/configs/vpnkit/defconfig
index b9f76fd0460..2842dfef5a0 100644
--- a/boards/sim/sim/sim/configs/vpnkit/defconfig
+++ b/boards/sim/sim/sim/configs/vpnkit/defconfig
@@ -45,7 +45,6 @@ CONFIG_MAX_TASKS=64
 CONFIG_MM_FILL_ALLOCATIONS=y
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
-CONFIG_NETDEV_IFINDEX=y
 CONFIG_NETDEV_PHY_IOCTL=y
 CONFIG_NETDOWN_NOTIFIER=y
 CONFIG_NETINIT_DHCPC=y