diff --git a/src/P2/preprocessing.py b/src/P2/preprocessing.py
index e3871f5..4324d0f 100644
--- a/src/P2/preprocessing.py
+++ b/src/P2/preprocessing.py
@@ -46,9 +46,10 @@ def normalize_numerical_values(df) -> DataFrame:
         "TOT_MUERTOS",
     ]
     filtered_df = df.filter(items=cols)
-    normalized_df = normalize(X=filtered_df)
-    updated_df = df.update(normalized_df)
-    return updated_df
+    normalized_data = normalize(X=filtered_df)
+    normalized_df = DataFrame(data=normalized_data, columns=filtered_df.columns)
+    df.update(normalized_df)
+    return df
 
 
 def parse_data(source, action) -> DataFrame: