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-rw-r--r--time/time.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/time/time.h b/time/time.h
index e824e64b9d..d12236fdf2 100644
--- a/time/time.h
+++ b/time/time.h
@@ -48,8 +48,10 @@ __BEGIN_DECLS
 
 /* This is the obsolete POSIX.1-1988 name for the same constant.  */
 #ifdef	__USE_POSIX
+#ifndef CLK_TCK
 #define	CLK_TCK		CLOCKS_PER_SEC
 #endif
+#endif
 
 #endif /* <time.h> included.  */