diff --git a/variants/STM32G4xx/G473R(B-C-E)T_G474R(B-C-E)T_G483RET_G484RET/variant_NUCLEO_G474RE.cpp b/variants/STM32G4xx/G473R(B-C-E)T_G474R(B-C-E)T_G483RET_G484RET/variant_NUCLEO_G474RE.cpp
index c321767d3f..cceaf69562 100644
--- a/variants/STM32G4xx/G473R(B-C-E)T_G474R(B-C-E)T_G483RET_G484RET/variant_NUCLEO_G474RE.cpp
+++ b/variants/STM32G4xx/G473R(B-C-E)T_G474R(B-C-E)T_G483RET_G484RET/variant_NUCLEO_G474RE.cpp
@@ -113,14 +113,13 @@ WEAK void SystemClock_Config(void)
   /* Configure the main internal regulator output voltage */
   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);
   /* Initializes the CPU, AHB and APB busses clocks */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSI48;
-  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
   RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
-  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
-  RCC_OscInitStruct.PLL.PLLN = 85;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;
+  RCC_OscInitStruct.PLL.PLLN = 28;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;