diff --git a/arch/Kconfig b/arch/Kconfig
index f7a23b17338..4f63fbbbfc2 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -121,7 +121,6 @@ config ARCH_SIM
 	select SERIAL_IFLOWCONTROL
 	select SCHED_HPWORK
 	select ARCH_HAVE_CPUINFO
-	select ARCH_MATH_H if LIBCXX
 	---help---
 		Linux/Cygwin user-mode simulation.
 
diff --git a/boards/sim/sim/sim/configs/citest/defconfig b/boards/sim/sim/sim/configs/citest/defconfig
index 185c010e6e1..c76baa64eb5 100644
--- a/boards/sim/sim/sim/configs/citest/defconfig
+++ b/boards/sim/sim/sim/configs/citest/defconfig
@@ -82,6 +82,7 @@ CONFIG_LIBC_MEMFD_ERROR=y
 CONFIG_LIBC_NETDB=y
 CONFIG_LIBC_NUMBERED_ARGS=y
 CONFIG_LIBC_SCANSET=y
+CONFIG_LIBM=y
 CONFIG_LIBUV=y
 CONFIG_LIBUV_THREADPOOL_SIZE=4
 CONFIG_LIBUV_THREAD_STACKSIZE=16384