diff --git a/configs/sim/nsh/defconfig b/configs/sim/nsh/defconfig
index 4583edc5485..be3e6a6e4dd 100644
--- a/configs/sim/nsh/defconfig
+++ b/configs/sim/nsh/defconfig
@@ -17,6 +17,7 @@ CONFIG_HOST_LINUX=y
 # Build Configuration
 #
 # CONFIG_APPS_DIR="../apps"
+CONFIG_BUILD_FLAT=y
 # CONFIG_BUILD_2PASS is not set
 
 #
@@ -80,11 +81,13 @@ CONFIG_HOST_X86_64=y
 # CONFIG_ARCH_DMA is not set
 # CONFIG_ARCH_HAVE_IRQPRIO is not set
 # CONFIG_ARCH_L2CACHE is not set
+# CONFIG_ARCH_HAVE_COHERENT_DCACHE is not set
 # CONFIG_CUSTOM_STACK is not set
 # CONFIG_ARCH_HAVE_ADDRENV is not set
 # CONFIG_ARCH_NEED_ADDRENV_MAPPING is not set
 # CONFIG_ARCH_HAVE_VFORK is not set
 # CONFIG_ARCH_HAVE_MMU is not set
+# CONFIG_ARCH_HAVE_MPU is not set
 # CONFIG_ARCH_NAND_HWECC is not set
 # CONFIG_ARCH_HAVE_EXTCLK is not set
 # CONFIG_ARCH_STACKDUMP is not set
@@ -231,6 +234,7 @@ CONFIG_IDLETHREAD_STACKSIZE=4096
 CONFIG_USERMAIN_STACKSIZE=4096
 CONFIG_PTHREAD_STACK_MIN=256
 CONFIG_PTHREAD_STACK_DEFAULT=8192
+# CONFIG_LIB_SYSCALL is not set
 
 #
 # Device Drivers