diff --git a/module/utils.py b/module/utils.py
index b6123e175d4afd859df96c2eaa489604ffe63ddc..d28cdb8478efe6d181f3213c0c3faa85942c5e5a 100644
--- a/module/utils.py
+++ b/module/utils.py
@@ -173,8 +173,8 @@ def armfinder_to_table(data_resistance:pd.DataFrame) ->  pd.DataFrame:
         family = data_resistance['Class'][res]
         
         if table[family][strain] != '' :
-               table[family][strain] += ";"
-        table[family][strain] += gene
+               table.loc[strain, family] += ";"
+        table.loc[strain, family] += gene
     return table