diff --git a/Inst_eddies/Analysis/plot_velocity.py b/Inst_eddies/Analysis/plot_velocity.py
index 0f5115b1925603688fe1c85a9de39f6ce2b86e1f..dcf70830166225d00c8ce77fdb83d89eca4184c0 100755
--- a/Inst_eddies/Analysis/plot_velocity.py
+++ b/Inst_eddies/Analysis/plot_velocity.py
@@ -15,7 +15,7 @@ import netCDF4
 import wind_cartopy
 
 
-def plot_velocity(input_file, window, undefined, scale):
+def plot_velocity(input_file, window=None, undefined=False, scale=20):
     with netCDF4.Dataset(input_file) as f:
         if "lon" in f.variables:
             lon = "lon"