diff --git a/cnam.marc/probatoire/build.py b/cnam.marc/probatoire/build.py
index 32cfd19..a97a42d 100755
--- a/cnam.marc/probatoire/build.py
+++ b/cnam.marc/probatoire/build.py
@@ -73,7 +73,7 @@ def main():
     os.chdir(directory)
     clean()
     os.makedirs(TMP)
-    build(len(sys.argv) == 1)
+    build(len(sys.argv) == 0)
     clean()