diff --git a/configs/mcu123-lpc214x/ostest/defconfig b/configs/mcu123-lpc214x/ostest/defconfig
index d4a1fb4127..8d6a46c7ea 100644
--- a/configs/mcu123-lpc214x/ostest/defconfig
+++ b/configs/mcu123-lpc214x/ostest/defconfig
@@ -331,6 +331,7 @@ CONFIG_NET_RESOLV_ENTRIES=4
 # Settings for examples/ostest
 CONFIG_EXAMPLES_OSTEST_LOOPS=1
 CONFIG_EXAMPLES_OSTEST_STACKSIZE=4096
+CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS=3
 
 #
 # Settings for examples/nsh