diff --git a/lib/libusb/libusb.h b/lib/libusb/libusb.h
index 225b539e907a..52ad914377bc 100644
--- a/lib/libusb/libusb.h
+++ b/lib/libusb/libusb.h
@@ -441,7 +441,7 @@ int	libusb_handle_events(libusb_context * ctx);
 int	libusb_handle_events_locked(libusb_context * ctx, struct timeval *tv);
 int	libusb_get_next_timeout(libusb_context * ctx, struct timeval *tv);
 void	libusb_set_pollfd_notifiers(libusb_context * ctx, libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb, void *user_data);
-struct libusb_pollfd **libusb_get_pollfds(libusb_context * ctx);
+const struct libusb_pollfd **libusb_get_pollfds(libusb_context * ctx);
 
 /* Synchronous device I/O */
 
diff --git a/lib/libusb/libusb10_io.c b/lib/libusb/libusb10_io.c
index 489ceb76caed..9aa31c484224 100644
--- a/lib/libusb/libusb10_io.c
+++ b/lib/libusb/libusb10_io.c
@@ -397,7 +397,7 @@ libusb_set_pollfd_notifiers(libusb_context *ctx,
 	ctx->fd_cb_user_data = user_data;
 }
 
-struct libusb_pollfd **
+const struct libusb_pollfd **
 libusb_get_pollfds(libusb_context *ctx)
 {
 	struct libusb_super_pollfd *pollfd;
@@ -423,7 +423,7 @@ libusb_get_pollfds(libusb_context *ctx)
 
 done:
 	CTX_UNLOCK(ctx);
-	return (ret);
+	return ((const struct libusb_pollfd **)ret);
 }