diff --git a/gd32f4xx/sdk/cmsis/gd/gd32f4xx/source/system_gd32f4xx.c b/gd32f4xx/sdk/cmsis/gd/gd32f4xx/source/system_gd32f4xx.c
index 4338ae1..b752ce8 100644
--- a/gd32f4xx/sdk/cmsis/gd/gd32f4xx/source/system_gd32f4xx.c
+++ b/gd32f4xx/sdk/cmsis/gd/gd32f4xx/source/system_gd32f4xx.c
@@ -41,8 +41,7 @@
 #define __SYS_OSC_CLK (__IRC16M) /* main oscillator frequency */
 
 /* select a system clock by uncommenting the following line */
-#define __SYSTEM_CLOCK_200M_PLL_25M_HXTAL (uint32_t)(200000000)
-
+#define __SYSTEM_CLOCK_120M_PLL_25M_HXTAL       (uint32_t)(120000000)
 #define RCU_MODIFY(__delay)                                                                                            \
     do {                                                                                                               \
         volatile uint32_t i;                                                                                           \