diff --git a/newlib/libc/sys/rtems/include/sys/filio.h b/newlib/libc/sys/rtems/include/sys/filio.h
index 1a3fc4293..e85db9cff 100644
--- a/newlib/libc/sys/rtems/include/sys/filio.h
+++ b/newlib/libc/sys/rtems/include/sys/filio.h
@@ -40,6 +40,7 @@
 #ifndef	_SYS_FILIO_H_
 #define	_SYS_FILIO_H_
 
+#include <sys/types.h>
 #include <sys/ioccom.h>
 
 /* Generic file-descriptor ioctl's. */