diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
index 3a2bcf8b12..b6afa71b27 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
@@ -244,8 +244,11 @@ static const USBDescriptor *get_descriptor(USBDriver *usbp,
 #if HAL_USE_SERIAL_USB
 uint32_t get_usb_baud(uint16_t endpoint_id)
 {
-    if(endpoint_id == 0)
-        return *((uint32_t*)linecoding.dwDTERate);
+    if (endpoint_id == 0) {
+        uint32_t rate;
+        memcpy(&rate, &linecoding.dwDTERate[0], sizeof(rate));
+        return rate;
+    }
     return 0;
 }
 #endif
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg_dualcdc.c b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg_dualcdc.c
index 5a407d748d..091cabf33d 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg_dualcdc.c
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg_dualcdc.c
@@ -307,8 +307,10 @@ static const USBDescriptor *get_descriptor(USBDriver *usbp,
 uint32_t get_usb_baud(uint16_t endpoint_id)
 {
   for (uint8_t i = 0; i < ARRAY_SIZE(linecoding); i++) {
-    if(endpoint_id == ep_index[i])
-        return *((uint32_t*)linecoding[i].dwDTERate);
+      if (endpoint_id == ep_index[i]) {
+          uint32_t rate;
+          memcpy(&rate, &linecoding[i].dwDTERate[0], sizeof(rate));
+      }
   }
   return 0;
 }