diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index 951428940..7102a4fa0 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -145,7 +145,9 @@ typedef _LOCK_RECURSIVE_T _flock_t;
 typedef void *_iconv_t;
 #endif
 
-#define	_CLOCK_T_	unsigned long		/* clock() */
+#define	_CLOCK_T_	unsigned long	/* clock() */
+typedef	_CLOCK_T_	__clock_t;
+
 #define	_TIME_T_	long			/* time() */
 #define _CLOCKID_T_ 	unsigned long
 #define _TIMER_T_   	unsigned long
diff --git a/newlib/libc/include/sys/times.h b/newlib/libc/include/sys/times.h
index dc072f464..b1f1dc699 100644
--- a/newlib/libc/include/sys/times.h
+++ b/newlib/libc/include/sys/times.h
@@ -7,9 +7,10 @@ extern "C" {
 #include <_ansi.h>
 #include <sys/_types.h>
 
-#ifndef __clock_t_defined
-typedef _CLOCK_T_ clock_t;
-#define __clock_t_defined
+#if !defined(__clock_t_defined) && !defined(_CLOCK_T_DECLARED)
+typedef	_CLOCK_T_	clock_t;
+#define	__clock_t_defined
+#define	_CLOCK_T_DECLARED
 #endif
 
 /*  Get Process Times, P1003.1b-1993, p. 92 */
diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index e48c2f256..f17821bce 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -96,9 +96,10 @@ typedef	unsigned int	uint;		/* System V compatibility */
 typedef	unsigned long	ulong;		/* System V compatibility */
 #endif
 
-#ifndef __clock_t_defined
-typedef _CLOCK_T_ clock_t;
-#define __clock_t_defined
+#if !defined(__clock_t_defined) && !defined(_CLOCK_T_DECLARED)
+typedef	_CLOCK_T_	clock_t;
+#define	__clock_t_defined
+#define	_CLOCK_T_DECLARED
 #endif
 
 #ifndef __time_t_defined