diff --git a/testhal/NUMICRO/NUC123/NUTINY-SDK-NUC123-V2.0/SERIAL/cfg/mcuconf.h b/testhal/NUMICRO/NUC123/NUTINY-SDK-NUC123-V2.0/SERIAL/cfg/mcuconf.h
index b8a941ce..b6de5d7a 100644
--- a/testhal/NUMICRO/NUC123/NUTINY-SDK-NUC123-V2.0/SERIAL/cfg/mcuconf.h
+++ b/testhal/NUMICRO/NUC123/NUTINY-SDK-NUC123-V2.0/SERIAL/cfg/mcuconf.h
@@ -26,8 +26,6 @@
  */
 #define NUC123_HSE_ENABLED TRUE
 #define NUC123_PLL_ENABLED TRUE
-#define NUC123_PLLSRC      NUC123_PLLSRC_HSE
-#define NUC123_HCLKSRC     NUC123_HCLKSRC_PLL
 
 #define NUC123_MCUCONF