diff --git a/ARGOS_service_data_converter.py b/ARGOS_service_data_converter.py
index 8daff10..ce05ec6 100755
--- a/ARGOS_service_data_converter.py
+++ b/ARGOS_service_data_converter.py
@@ -446,7 +446,7 @@ def AZ(self, s1):
         return output
 
 
-def pandas2netcdf(df=None, ofile="data.nc":
+def pandas2netcdf(df=None, ofile="data.nc"):
 
     if df.empty:
         return