diff --git a/rtos/mbed_lib.json b/rtos/mbed_lib.json
index 996127d..a062ce3 100644
--- a/rtos/mbed_lib.json
+++ b/rtos/mbed_lib.json
@@ -49,6 +49,9 @@
 	    },
 	    "MCU_NRF51_UNIFIED": {
 	        "target.boot-stack-size": "0x800"
-	    }
+	    },
+        "NUVOTON": {
+            "idle-thread-stack-size-debug-extra": 512
+        }
     }
 }