diff --git a/inc/util.h b/inc/util.h
index e845516..04a217a 100644
--- a/inc/util.h
+++ b/inc/util.h
@@ -4,6 +4,8 @@
 #include <uv.h>
 #include <unistd.h>
 
+struct rfb_pixel_format;
+
 struct vnc_write_request {
 	uv_write_t request;
 	uv_write_cb on_done;