diff --git a/include/jemalloc/internal/jemalloc_internal_decls.h b/include/jemalloc/internal/jemalloc_internal_decls.h
index 0f29e676..0bca63e5 100644
--- a/include/jemalloc/internal/jemalloc_internal_decls.h
+++ b/include/jemalloc/internal/jemalloc_internal_decls.h
@@ -62,11 +62,5 @@ isblank(int c)
 #include <fcntl.h>
 
 #include <sys/time.h>
-#ifdef _WIN32
-struct timespec {
-	time_t	tv_sec;
-	long	tv_nsec;
-};
-#endif
 
 #endif /* JEMALLOC_INTERNAL_H */