diff --git a/cnam/thesis/build.py b/cnam/thesis/build.py
index 667bbc6..5a58a27 100755
--- a/cnam/thesis/build.py
+++ b/cnam/thesis/build.py
@@ -120,12 +120,11 @@ def build(directory, sign):
                                ]).decode('u8').splitlines()
                 id = lines[2].index('"')
                 lines = [
-                    lines[0],
-                    lines[1],
-                    lines[2][:id] + lines[4][id:]
-                    .replace('@', ' @ ')
-                    .replace('.', ' ⋅ ')
-                ] + lines[5:]
+                    *lines[:2],
+                    *[line.replace('@', ' @ ').replace('.', ' ⋅ ')
+                      for line in lines[2:4]],
+                    *lines[-2:]
+                ]
                 # write verification file
                 buffer = os.linesep.join(lines).encode('u8')
                 with open(os.path.join(directory, f'{pdf}.vrf'), 'bw') as f: