diff --git a/hw/bsp/stm32h7/boards/daisyseed/board.h b/hw/bsp/stm32h7/boards/daisyseed/board.h
index 579c09727..0ad809720 100644
--- a/hw/bsp/stm32h7/boards/daisyseed/board.h
+++ b/hw/bsp/stm32h7/boards/daisyseed/board.h
@@ -57,9 +57,9 @@
 //--------------------------------------------------------------------+
 static inline void board_stm32h7_clock_init(void)
 {
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
+  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
+  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = { 0 };
 
   /*!< Supply configuration update enable */
   /* For STM32H750XB, use "HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);" */
diff --git a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.h b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.h
index 56a48ec24..0eb5e76ad 100644
--- a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.h
+++ b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.h
@@ -64,8 +64,8 @@
 //--------------------------------------------------------------------+
 static inline void board_stm32h7_clock_init(void)
 {
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
+  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
 
   /* The PWR block is always enabled on the H7 series- there is no clock
      enable. For now, use the default VOS3 scale mode (lowest) and limit clock
@@ -111,7 +111,7 @@ static inline void board_stm32h7_clock_init(void)
      separate. However, the main system PLL (PLL1) doesn't have a direct
      connection to the USB peripheral clock to generate 48 MHz, so we do this
      dance. This will connect PLL1's Q output to the USB peripheral clock. */
-  RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct;
+  RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct = { 0 };
 
   RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
   RCC_PeriphCLKInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_PLL;
diff --git a/hw/bsp/stm32h7/boards/stm32h743eval/board.h b/hw/bsp/stm32h7/boards/stm32h743eval/board.h
index af2063ce0..666bec9a1 100644
--- a/hw/bsp/stm32h7/boards/stm32h743eval/board.h
+++ b/hw/bsp/stm32h7/boards/stm32h743eval/board.h
@@ -63,9 +63,9 @@
 //--------------------------------------------------------------------+
 static inline void board_stm32h7_clock_init(void)
 {
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
+  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
+  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = { 0 };
 
   /*!< Supply configuration update enable */
   HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
diff --git a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.h b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.h
index 06148c875..8c6a7ce5a 100644
--- a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.h
+++ b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.h
@@ -55,8 +55,8 @@
 //--------------------------------------------------------------------+
 static inline void board_stm32h7_clock_init(void)
 {
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
+  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
 
   /* The PWR block is always enabled on the H7 series- there is no clock
      enable. For now, use the default VOS3 scale mode (lowest) and limit clock
@@ -102,7 +102,7 @@ static inline void board_stm32h7_clock_init(void)
      separate. However, the main system PLL (PLL1) doesn't have a direct
      connection to the USB peripheral clock to generate 48 MHz, so we do this
      dance. This will connect PLL1's Q output to the USB peripheral clock. */
-  RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct;
+  RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct = { 0 };
 
   RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
   RCC_PeriphCLKInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_PLL;
diff --git a/hw/bsp/stm32h7/boards/stm32h745disco/board.h b/hw/bsp/stm32h7/boards/stm32h745disco/board.h
index d33e0c8eb..d7d3e8723 100644
--- a/hw/bsp/stm32h7/boards/stm32h745disco/board.h
+++ b/hw/bsp/stm32h7/boards/stm32h745disco/board.h
@@ -57,9 +57,9 @@
 //--------------------------------------------------------------------+
 static inline void board_stm32h7_clock_init(void)
 {
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
+  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
+  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = { 0 };
 
   /*!< Supply configuration update enable */
   /* For STM32H750XB, use "HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);" */