diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index 752e135789c..f65a1987ffa 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -108,7 +108,7 @@
 #define	SEEK_CUR	1	/* set file offset to current plus offset */
 #define	SEEK_END	2	/* set file offset to EOF plus offset */
 #endif
-#if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
+#if __BSD_VISIBLE
 #define	SEEK_DATA	3	/* set file offset to next data past offset */
 #define	SEEK_HOLE	4	/* set file offset to next hole past offset */
 #endif