diff --git a/User/main.c b/User/main.c
index 92d4dcb..69bd363 100644
--- a/User/main.c
+++ b/User/main.c
@@ -50,8 +50,8 @@ int main(void) {
     USART_Printf_Init(115200);
 #endif
     printf("SystemClk: %ld\r\n", SystemCoreClock);
-    printf("DeviceID: %08x\r\n", DBGMCU_GetDEVID());
-    printf("ChipID: %08x\r\n", DBGMCU_GetCHIPID());
+    printf("DeviceID: %08lx\r\n", DBGMCU_GetDEVID());
+    printf("ChipID: %08lx\r\n", DBGMCU_GetCHIPID());
 
     GPIO_LED_Init();