diff --git a/targets/TARGET_NUVOTON/mbed_rtx.h b/targets/TARGET_NUVOTON/mbed_rtx.h
index e55fd85151..78f24ee6f6 100644
--- a/targets/TARGET_NUVOTON/mbed_rtx.h
+++ b/targets/TARGET_NUVOTON/mbed_rtx.h
@@ -80,7 +80,7 @@
 #define OS_MAINSTKSIZE          256
 #endif
 #ifndef OS_CLOCK
-#define OS_CLOCK                160000000
+#define OS_CLOCK                192000000
 #endif
 
 #if defined(__CC_ARM)