diff --git a/validity_check.py b/validity_check.py
index ff92bde413ecd54f985d8870af1c4749e3c84f4c..4e8bbabf8bd061389af3fa1f2ec54ba69501db33 100644
--- a/validity_check.py
+++ b/validity_check.py
@@ -29,6 +29,6 @@ if __name__ == "__main__":
         if i<3 and prev_line[i] != curr_line[i] :
             print('You modify your data !\n')
             exit(1)
-    if(curr_line[3]) !='VU' or (curr_line[3]) !=' VU' or (curr_line[3]) !='VU ':
+    if(curr_line[3]) !='VU' and (curr_line[3]) !=' VU' and (curr_line[3]) !='VU ':
         print('You have to write "VU" in the last column !\n')
         exit(1)