diff --git a/boards/sim/sim/sim/configs/cxxtest/defconfig b/boards/sim/sim/sim/configs/cxxtest/defconfig
index ea3d8ef40dc..ed7c6980126 100644
--- a/boards/sim/sim/sim/configs/cxxtest/defconfig
+++ b/boards/sim/sim/sim/configs/cxxtest/defconfig
@@ -5,7 +5,6 @@
 # You can then do "make savedefconfig" to generate a new defconfig file that includes your
 # modifications.
 #
-# CONFIG_CXX_EXCEPTION is not set
 CONFIG_ARCH="sim"
 CONFIG_ARCH_BOARD="sim"
 CONFIG_ARCH_BOARD_SIM=y
diff --git a/boards/sim/sim/sim/configs/libcxxtest/defconfig b/boards/sim/sim/sim/configs/libcxxtest/defconfig
index dd5bbc84de8..48138a0426b 100644
--- a/boards/sim/sim/sim/configs/libcxxtest/defconfig
+++ b/boards/sim/sim/sim/configs/libcxxtest/defconfig
@@ -5,7 +5,6 @@
 # You can then do "make savedefconfig" to generate a new defconfig file that includes your
 # modifications.
 #
-# CONFIG_CXX_EXCEPTION is not set
 # CONFIG_NSH_CMDOPT_HEXDUMP is not set
 CONFIG_ARCH="sim"
 CONFIG_ARCH_BOARD="sim"
@@ -17,6 +16,7 @@ CONFIG_BOARDCTL_POWEROFF=y
 CONFIG_BOARD_LOOPSPERMSEC=0
 CONFIG_BOOT_RUNFROMEXTSRAM=y
 CONFIG_BUILTIN=y
+CONFIG_CXX_EXCEPTION=y
 CONFIG_DEBUG_ASSERTIONS=y
 CONFIG_DEBUG_BINFMT=y
 CONFIG_DEBUG_BINFMT_ERROR=y
diff --git a/libs/libxx/Kconfig b/libs/libxx/Kconfig
index bdf3b9b56af..a20d1ee1eb9 100644
--- a/libs/libxx/Kconfig
+++ b/libs/libxx/Kconfig
@@ -83,7 +83,6 @@ config HAVE_CXXINITIALIZE
 
 config CXX_EXCEPTION
 	bool "Enable Exception Support"
-	default LIBCXX || UCLIBCXX
 
 if UCLIBCXX