diff --git a/download_digital.py b/download_digital.py
index a8bd597..f11e2ac 100644
--- a/download_digital.py
+++ b/download_digital.py
@@ -104,6 +104,7 @@ def construct_dataframe(
 
     data["Digitale Befragung"] = pd.Series(tot_col_data, index=tot_col_index)
     df = pd.DataFrame(data=data)
+    df = df.astype({"Digitale Befragung": "Int32"})
     if grouped:
         df = df.groupby("Bundesland", as_index=False)[["Digitale Befragung"]].sum()