diff --git a/newlib/libc/sys/rtems/include/machine/_types.h b/newlib/libc/sys/rtems/include/machine/_types.h
index e1b4c6466..a30d5a3c1 100644
--- a/newlib/libc/sys/rtems/include/machine/_types.h
+++ b/newlib/libc/sys/rtems/include/machine/_types.h
@@ -28,6 +28,9 @@ typedef	unsigned long	__ino_t;
 typedef	__uint32_t	__mode_t;
 #define	__machine_mode_t_defined
 
+typedef	__uint64_t	_CLOCK_T_;
+#define	__machine_clock_t_defined
+
 typedef	int		__accmode_t;	/* access permissions */
 typedef	__uint32_t	__fixpt_t;	/* fixed point number */
 typedef	int		__lwpid_t;	/* Thread ID (a.k.a. LWP) */