diff --git a/cpp/hidapi/libusb/hid.c b/cpp/hidapi/libusb/hid.c
index 6aedc0fc..4d87dfd2 100644
--- a/cpp/hidapi/libusb/hid.c
+++ b/cpp/hidapi/libusb/hid.c
@@ -335,7 +335,7 @@ static wchar_t *get_usb_string(libusb_device_handle *dev, uint8_t idx)
 	size_t inbytes;
 	size_t outbytes;
 	size_t res;
-	char *inptr;
+	const char *inptr;
 	char *outptr;
 
 	/* Determine which language to use. */