diff --git a/src/backend/backend.c b/src/backend/backend.c
index a9535c8..9893b84 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -10,6 +10,7 @@
 #include "region.h"
 #include "types.h"
 #include "win.h"
+#include "x.h"
 
 extern struct backend_operations xrender_ops, dummy_ops;
 #ifdef CONFIG_OPENGL