diff --git a/newlib/libc/include/sys/_timespec.h b/newlib/libc/include/sys/_timespec.h
index 4a7aabcb1..7609e4a46 100644
--- a/newlib/libc/include/sys/_timespec.h
+++ b/newlib/libc/include/sys/_timespec.h
@@ -36,9 +36,10 @@
 
 #include <sys/_types.h>
 
-#ifndef __time_t_defined
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED)
 typedef	_TIME_T_	time_t;
 #define	__time_t_defined
+#define	_TIME_T_DECLARED
 #endif
 
 struct timespec {
diff --git a/newlib/libc/include/sys/_timeval.h b/newlib/libc/include/sys/_timeval.h
index d813d1f5b..676a0b894 100644
--- a/newlib/libc/include/sys/_timeval.h
+++ b/newlib/libc/include/sys/_timeval.h
@@ -36,9 +36,10 @@ typedef	__suseconds_t	suseconds_t;
 #define	_SUSECONDS_T_DECLARED
 #endif
 
-#ifndef __time_t_defined
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED)
 typedef	_TIME_T_	time_t;
 #define	__time_t_defined
+#define	_TIME_T_DECLARED
 #endif
 
 /* This define is also used outside of Newlib, e.g. in MinGW-w64 */
diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index 7102a4fa0..1ba4c6469 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -148,7 +148,9 @@ typedef void *_iconv_t;
 #define	_CLOCK_T_	unsigned long	/* clock() */
 typedef	_CLOCK_T_	__clock_t;
 
-#define	_TIME_T_	long			/* time() */
+#define	_TIME_T_	long		/* time() */
+typedef	_TIME_T_	__time_t;
+
 #define _CLOCKID_T_ 	unsigned long
 #define _TIMER_T_   	unsigned long
 
diff --git a/newlib/libc/include/sys/timeb.h b/newlib/libc/include/sys/timeb.h
index 264783050..793b48143 100644
--- a/newlib/libc/include/sys/timeb.h
+++ b/newlib/libc/include/sys/timeb.h
@@ -17,9 +17,10 @@ extern "C" {
 #include <_ansi.h>
 #include <sys/_types.h>
 
-#ifndef __time_t_defined
-typedef _TIME_T_ time_t;
-#define __time_t_defined
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED)
+typedef	_TIME_T_	time_t;
+#define	__time_t_defined
+#define	_TIME_T_DECLARED
 #endif
 
 struct timeb
diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index f17821bce..2338cf50b 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -102,9 +102,10 @@ typedef	_CLOCK_T_	clock_t;
 #define	_CLOCK_T_DECLARED
 #endif
 
-#ifndef __time_t_defined
-typedef _TIME_T_ time_t;
-#define __time_t_defined
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED)
+typedef	_TIME_T_	time_t;
+#define	__time_t_defined
+#define	_TIME_T_DECLARED
 #endif
 
 #ifndef __daddr_t_defined
diff --git a/newlib/libc/sys/sparc64/sys/_timeval.h b/newlib/libc/sys/sparc64/sys/_timeval.h
index fbe9ce64d..b0aaeda7e 100644
--- a/newlib/libc/sys/sparc64/sys/_timeval.h
+++ b/newlib/libc/sys/sparc64/sys/_timeval.h
@@ -3,9 +3,10 @@
 
 #include <sys/_types.h>
 
-#ifndef __time_t_defined
-typedef _TIME_T_        time_t;
-#define __time_t_defined
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED)
+typedef	_TIME_T_	time_t;
+#define	__time_t_defined
+#define	_TIME_T_DECLARED
 #endif
 
 #ifdef __cplusplus