diff --git a/libfprint/core.c b/libfprint/core.c
index 01af59b9..f0c26298 100644
--- a/libfprint/core.c
+++ b/libfprint/core.c
@@ -357,7 +357,8 @@ static struct fp_driver *find_supporting_driver(libusb_device *udev,
 	const struct usb_id **usb_id)
 {
 	GSList *elem = registered_drivers;
-	struct libusb_device_descriptor *dsc = libusb_get_device_descriptor(udev);
+	const struct libusb_device_descriptor *dsc =
+		libusb_get_device_descriptor(udev);
 	
 	do {
 		struct fp_driver *drv = elem->data;
diff --git a/libfprint/drivers/uru4000.c b/libfprint/drivers/uru4000.c
index 906b3072..f2a0fdf3 100644
--- a/libfprint/drivers/uru4000.c
+++ b/libfprint/drivers/uru4000.c
@@ -1102,10 +1102,10 @@ static void dev_deactivate(struct fp_img_dev *dev)
 
 static int dev_init(struct fp_img_dev *dev, unsigned long driver_data)
 {
-	struct libusb_config_descriptor *config;
-	struct libusb_interface *iface = NULL;
-	struct libusb_interface_descriptor *iface_desc;
-	struct libusb_endpoint_descriptor *ep;
+	const struct libusb_config_descriptor *config;
+	const struct libusb_interface *iface = NULL;
+	const struct libusb_interface_descriptor *iface_desc;
+	const struct libusb_endpoint_descriptor *ep;
 	struct uru4k_dev *urudev;
 	int i;
 	int r;
@@ -1113,7 +1113,7 @@ static int dev_init(struct fp_img_dev *dev, unsigned long driver_data)
 	/* Find fingerprint interface */
 	config = libusb_get_config_descriptor(libusb_get_device(dev->udev));
 	for (i = 0; i < config->bNumInterfaces; i++) {
-		struct libusb_interface *cur_iface = &config->interface[i];
+		const struct libusb_interface *cur_iface = &config->interface[i];
 
 		if (cur_iface->num_altsetting < 1)
 			continue;
diff --git a/libfprint/poll.c b/libfprint/poll.c
index 9e5523e7..1c357419 100644
--- a/libfprint/poll.c
+++ b/libfprint/poll.c
@@ -291,8 +291,8 @@ API_EXPORTED int fp_get_next_timeout(struct timeval *tv)
  */
 API_EXPORTED size_t fp_get_pollfds(struct fp_pollfd **pollfds)
 {
-	struct libusb_pollfd **usbfds;
-	struct libusb_pollfd *usbfd;
+	const struct libusb_pollfd **usbfds;
+	const struct libusb_pollfd *usbfd;
 	struct fp_pollfd *ret;
 	size_t cnt = 0;
 	size_t i = 0;