diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/stm32h7_mcuconf.h b/libraries/AP_HAL_ChibiOS/hwdef/common/stm32h7_mcuconf.h
index 7a523438bc..6ad2e4ab69 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/stm32h7_mcuconf.h
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/stm32h7_mcuconf.h
@@ -199,14 +199,15 @@
 #ifdef HAL_CUSTOM_MCU_CLOCKRATE
 #if HAL_CUSTOM_MCU_CLOCKRATE == 480000000
 #define STM32_PLL1_DIVN_VALUE               120
+#define STM32_PLL1_DIVQ_VALUE               12
 #else
 #error "Unable to configure custom clockrate"
 #endif
 #else
 #define STM32_PLL1_DIVN_VALUE               100
+#define STM32_PLL1_DIVQ_VALUE               10
 #endif
 #define STM32_PLL1_DIVP_VALUE               2
-#define STM32_PLL1_DIVQ_VALUE               10
 #define STM32_PLL1_DIVR_VALUE               2
 
 #define STM32_PLL2_DIVN_VALUE               50