diff --git a/include/sys/uio.h b/include/sys/uio.h
index 60c5c2fe..09b6ab9e 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -27,6 +27,11 @@ ssize_t writev (int, const struct iovec *, int);
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 ssize_t preadv (int, const struct iovec *, int, off_t);
 ssize_t pwritev (int, const struct iovec *, int, off_t);
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define preadv64 preadv
+#define pwritev64 pwritev
+#define off64_t off_t
+#endif
 #endif
 
 #ifdef _GNU_SOURCE
diff --git a/src/unistd/preadv.c b/src/unistd/preadv.c
index 371e46f8..46d9ece7 100644
--- a/src/unistd/preadv.c
+++ b/src/unistd/preadv.c
@@ -1,4 +1,4 @@
-#define _GNU_SOURCE
+#define _BSD_SOURCE
 #include <sys/uio.h>
 #include <unistd.h>
 #include "syscall.h"
diff --git a/src/unistd/pwritev.c b/src/unistd/pwritev.c
index 1df268d5..aec5d323 100644
--- a/src/unistd/pwritev.c
+++ b/src/unistd/pwritev.c
@@ -1,4 +1,4 @@
-#define _GNU_SOURCE
+#define _BSD_SOURCE
 #include <sys/uio.h>
 #include <unistd.h>
 #include "syscall.h"