diff --git a/configs/sim/ostest/defconfig b/configs/sim/ostest/defconfig
index a84e237d4d..fd78374739 100644
--- a/configs/sim/ostest/defconfig
+++ b/configs/sim/ostest/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
 
 #
@@ -93,6 +94,7 @@ CONFIG_SIM_M32=y
 CONFIG_HOST_X86_64=y
 # CONFIG_HOST_X86 is not set
 # CONFIG_SIM_WALLTIME is not set
+# CONFIG_SIM_SPIFLASH is not set
 
 #
 # Architecture Options
@@ -102,10 +104,12 @@ 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_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
@@ -187,6 +191,9 @@ CONFIG_PREALLOC_TIMERS=8
 #
 # Tasks and Scheduling
 #
+# CONFIG_INIT_NONE is not set
+CONFIG_INIT_ENTRYPOINT=y
+# CONFIG_INIT_FILEPATH is not set
 CONFIG_USER_ENTRYPOINT="ostest_main"
 CONFIG_RR_INTERVAL=0
 CONFIG_TASK_NAME_SIZE=32
@@ -250,6 +257,7 @@ 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