diff --git a/cnam/travaux/blanc/build.py b/cnam/travaux/blanc/build.py
index 4acbde4..2598869 100755
--- a/cnam/travaux/blanc/build.py
+++ b/cnam/travaux/blanc/build.py
@@ -9,14 +9,16 @@ DOCUMENTS = [
 ]
 
 
-def build():
+def build(directory):
+    os.chdir(directory)
     for document in DOCUMENTS:
         command = ['xelatex', f'{document}.tex']
         for _ in range(2):
             subprocess.call(command)
 
 
-def clean():
+def clean(directory):
+    os.chdir(directory)
     _, _, files = next(os.walk(directory))
     for file in files:
         name, ext = os.path.splitext(file)
@@ -27,9 +29,8 @@ def clean():
 def main():
     file = os.path.realpath(__file__)
     directory = os.path.dirname(file)
-    os.chdir(directory)
-    build()
-    clean()
+    build(directory)
+    clean(directory)
 
 
 if __name__ == '__main__':