diff --git a/generator.c b/generator.c
index 3a4504f..2f64f5d 100644
--- a/generator.c
+++ b/generator.c
@@ -588,7 +588,11 @@ int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
        if (ignore_times)
                return 0;
 
-       return cmp_time(st->st_mtime, file->modtime) == 0;
+       return cmp_time(st->st_mtime, file->modtime) == 0
+#ifdef ST_MTIME_NSEC
+               && st->ST_MTIME_NSEC == F_MOD_NSEC(file)
+#endif
+               ;
 }