diff --git a/arch/sim/src/up_idle.c b/arch/sim/src/up_idle.c
index ae7c2d7040d..3cc7875b993 100644
--- a/arch/sim/src/up_idle.c
+++ b/arch/sim/src/up_idle.c
@@ -117,7 +117,7 @@ void up_idle(void)
 #endif
 
 
-#ifdef CONFIG_NET
+#ifdef CONFIG_NET_ETHERNET
   /* Run the network if enabled */
 
   netdriver_loop();
diff --git a/arch/sim/src/up_initialize.c b/arch/sim/src/up_initialize.c
index 6ae39f94ae9..82eb32d1cec 100644
--- a/arch/sim/src/up_initialize.c
+++ b/arch/sim/src/up_initialize.c
@@ -158,7 +158,7 @@ void up_initialize(void)
   up_registerblockdevice(); /* Our FAT ramdisk at /dev/ram0 */
 #endif
 
-#ifdef CONFIG_NET
+#ifdef CONFIG_NET_ETHERNET
   netdriver_init();         /* Our "real" network driver */
 #endif