diff --git a/demos/STM32/RT-STM32H755ZI-NUCLEO144/cfg/mcuconf.h b/demos/STM32/RT-STM32H755ZI-NUCLEO144/cfg/mcuconf.h
index 89654754c..da0576591 100644
--- a/demos/STM32/RT-STM32H755ZI-NUCLEO144/cfg/mcuconf.h
+++ b/demos/STM32/RT-STM32H755ZI-NUCLEO144/cfg/mcuconf.h
@@ -88,10 +88,10 @@
 #define STM32_PLL1_Q_ENABLED                TRUE
 #define STM32_PLL1_R_ENABLED                TRUE
 #define STM32_PLL1_DIVM_VALUE               4
-#define STM32_PLL1_DIVN_VALUE               400
+#define STM32_PLL1_DIVN_VALUE               480
 #define STM32_PLL1_FRACN_VALUE              0
 #define STM32_PLL1_DIVP_VALUE               2
-#define STM32_PLL1_DIVQ_VALUE               16
+#define STM32_PLL1_DIVQ_VALUE               20
 #define STM32_PLL1_DIVR_VALUE               8
 #define STM32_PLL2_ENABLED                  TRUE
 #define STM32_PLL2_P_ENABLED                TRUE