diff --git a/src/common/define_plus.h b/src/common/define_plus.h
index 3e771d765ceb02f02ae4b930d34afb5ec13593a6..09e12af584d3825d8d5edfee45851c3b55805552 100644
--- a/src/common/define_plus.h
+++ b/src/common/define_plus.h
@@ -136,7 +136,7 @@ struct HostUSBEndpoint {
 struct HdcUSB {
 #ifdef HDC_HOST
     libusb_context *ctxUSB = nullptr;  // child-use, main null
-    libusb_device *device;
+    libusb_device *device = nullptr;
     libusb_device_handle *devHandle = nullptr;
     uint16_t retryCount;
     uint8_t devId;