diff --git a/boards/xtensa/esp32/esp32-devkitc/configs/knsh/defconfig b/boards/xtensa/esp32/esp32-devkitc/configs/knsh/defconfig
index 4bb681003f68d..2f3a66843f419 100644
--- a/boards/xtensa/esp32/esp32-devkitc/configs/knsh/defconfig
+++ b/boards/xtensa/esp32/esp32-devkitc/configs/knsh/defconfig
@@ -62,4 +62,5 @@ CONFIG_SYSTEM_NSH=y
 CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_OSTEST=y
 CONFIG_TESTING_OSTEST_FPUTESTDISABLE=y
+CONFIG_TESTING_OSTEST_NBARRIER_THREADS=4
 CONFIG_UART0_SERIAL_CONSOLE=y