diff --git a/boards/sim/sim/sim/configs/cxxtest/defconfig b/boards/sim/sim/sim/configs/cxxtest/defconfig
index 1542b10965..e2a392be25 100644
--- a/boards/sim/sim/sim/configs/cxxtest/defconfig
+++ b/boards/sim/sim/sim/configs/cxxtest/defconfig
@@ -12,6 +12,7 @@ CONFIG_ARCH_BOARD_SIM=y
 CONFIG_ARCH_CHIP="sim"
 CONFIG_ARCH_SIM=y
 CONFIG_BOARD_LOOPSPERMSEC=100
+CONFIG_CXX_NEWLONG=y
 CONFIG_HAVE_CXX=y
 CONFIG_IDLETHREAD_STACKSIZE=4096
 CONFIG_LIBM=y
diff --git a/boards/sim/sim/sim/configs/nsh2/defconfig b/boards/sim/sim/sim/configs/nsh2/defconfig
index 5c16b7afdd..dd1b1f52eb 100644
--- a/boards/sim/sim/sim/configs/nsh2/defconfig
+++ b/boards/sim/sim/sim/configs/nsh2/defconfig
@@ -14,6 +14,7 @@ CONFIG_ARCH_BOARD_SIM=y
 CONFIG_ARCH_CHIP="sim"
 CONFIG_ARCH_SIM=y
 CONFIG_BUILTIN=y
+CONFIG_CXX_NEWLONG=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DISABLE_POSIX_TIMERS=y
 CONFIG_EXAMPLES_NX=y
diff --git a/boards/sim/sim/sim/configs/nxlines/defconfig b/boards/sim/sim/sim/configs/nxlines/defconfig
index 9218689c98..f7ff39f9cf 100644
--- a/boards/sim/sim/sim/configs/nxlines/defconfig
+++ b/boards/sim/sim/sim/configs/nxlines/defconfig
@@ -15,6 +15,7 @@ CONFIG_ARCH_BOARD_SIM=y
 CONFIG_ARCH_CHIP="sim"
 CONFIG_ARCH_SIM=y
 CONFIG_BOARD_LOOPSPERMSEC=0
+CONFIG_CXX_NEWLONG=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DISABLE_POSIX_TIMERS=y
 CONFIG_EXAMPLES_NXLINES=y
diff --git a/boards/sim/sim/sim/configs/nxwm/defconfig b/boards/sim/sim/sim/configs/nxwm/defconfig
index 45f760c948..6c54b022b4 100644
--- a/boards/sim/sim/sim/configs/nxwm/defconfig
+++ b/boards/sim/sim/sim/configs/nxwm/defconfig
@@ -13,6 +13,7 @@ CONFIG_ARCH_BOARD="sim"
 CONFIG_ARCH_BOARD_SIM=y
 CONFIG_ARCH_CHIP="sim"
 CONFIG_ARCH_SIM=y
+CONFIG_CXX_NEWLONG=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DISABLE_POSIX_TIMERS=y
 CONFIG_FAT_LCNAMES=y