diff --git a/configs/sim/nsh/defconfig b/configs/sim/nsh/defconfig
index 8bafbacfeb5..b7d9b475581 100644
--- a/configs/sim/nsh/defconfig
+++ b/configs/sim/nsh/defconfig
@@ -264,8 +264,8 @@ CONFIG_PTHREAD_STACK_DEFAULT=8192
 #
 CONFIG_DISABLE_POLL=y
 CONFIG_DEV_NULL=y
-# CONFIG_DEV_ZERO is not set
-# CONFIG_DEV_LOOP is not set
+CONFIG_DEV_ZERO=y
+CONFIG_DEV_LOOP=y
 
 #
 # Buffering