diff --git a/include/kernel/drivers/bus.h b/include/kernel/drivers/bus.h
index eefb1be..39bc583 100644
--- a/include/kernel/drivers/bus.h
+++ b/include/kernel/drivers/bus.h
@@ -7,6 +7,7 @@
 # define UKERNEL_DRIVERS_BUS_H
 
 # include <stdarg.h>
+# include <stddef.h>
 # include <stdint.h>