diff --git a/ch5/os/build.rs b/ch5/os/build.rs
index c103d93..50b0327 100644
--- a/ch5/os/build.rs
+++ b/ch5/os/build.rs
@@ -72,6 +72,7 @@ _app_names:"#
     .section .data
     .global app_{0}_start
     .global app_{0}_end
+    .align 3
 app_{0}_start:
     .incbin "{2}{1}"
 app_{0}_end:"#,
@@ -79,4 +80,4 @@ app_{0}_end:"#,
         )?;
     }
     Ok(())
-}
+}
\ No newline at end of file