ngx_fs_bsize()
diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index 21e5ff4..dcd14c3 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -274,4 +274,7 @@
 #endif
 
 
+size_t ngx_fs_bsize(u_char *name);
+
+
 #endif /* _NGX_FILES_H_INCLUDED_ */