diff --git a/arch/sim/src/sim/CMakeLists.txt b/arch/sim/src/sim/CMakeLists.txt
index 21ab50b6a8..505d4aa63c 100644
--- a/arch/sim/src/sim/CMakeLists.txt
+++ b/arch/sim/src/sim/CMakeLists.txt
@@ -187,7 +187,8 @@ elseif(CONFIG_SIM_NETDEV_VPNKIT)
   list(APPEND SRCS sim_netdriver.c)
   list(APPEND HOST_DEFINITIONS
        CONFIG_SIM_NETDEV_VPNKIT_PATH=\"${CONFIG_SIM_NETDEV_VPNKIT_PATH}\")
-  list(APPEND HOSTSRCS sim_vpnkit.c vpnkit/protocol.c vpnkit/negotiate.c)
+  list(APPEND HOSTSRCS sim_vpnkit.c vpnkit/sim_protocol.c
+       vpnkit/sim_negotiate.c)
 endif()
 
 if(CONFIG_SIM_NETUSRSOCK)