--- a/lib/isc/unix/file.c
+++ b/lib/isc/unix/file.c
@@ -153,7 +153,7 @@
 		 * XXXDCL some operating systems provide nanoseconds, too,
 		 * such as BSD/OS via st_mtimespec.
 		 */
-		isc_time_set(modtime, stats.st_mtime, 0);
+		isc_time_set(modtime, stats.st_mtime, stats.st_mtim.tv_nsec);
 
 	return (result);
 }