diff --git a/driver.h b/driver.h
index 83d6c092fd..ed80623f4f 100644
--- a/driver.h
+++ b/driver.h
@@ -19,6 +19,7 @@
 #ifndef __DRIVER__H
 #define __DRIVER__H
 
+#include <sys/types.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdint.h>