diff --git a/csv_merge.py b/csv_merge.py
index 0d2cc40..58ee723 100644
--- a/csv_merge.py
+++ b/csv_merge.py
@@ -20,8 +20,8 @@ def process(directory):
 def merge(mainDF:pd.DataFrame, candDF:pd.DataFrame, outname):
     #add new columns to main dataframe
     colNum = len(mainDF.columns)
-    mainDF.insert(colNum, "probability", 0)
-    mainDF.insert(colNum+1, "label", 0)
+    mainDF.insert(colNum, "probability", float(0))
+    mainDF.insert(colNum+1, "label", float(0))
 
     #iterate over candidates
     for props in candDF.itertuples(index=False):