diff --git a/second-edition/tools/src/bin/concat_chapters.rs b/second-edition/tools/src/bin/concat_chapters.rs
index af27b8f45..accb2d3d1 100644
--- a/second-edition/tools/src/bin/concat_chapters.rs
+++ b/second-edition/tools/src/bin/concat_chapters.rs
@@ -100,6 +100,7 @@ fn concat_files(source_paths: Vec<PathBuf>, target_path: PathBuf) -> io::Result<
 
         try!(target.write_all(b"\n"));
         try!(target.write_all(&contents));
+        try!(target.write_all(b"\n"));
     }
     Ok(())
 }