diff --git a/regression_test.py b/regression_test.py
index b2f9e78d188846ccb261f64013147bf98da2f730..487c9b8e3c85c97cf2160acd9e8405f904065683 100644
--- a/regression_test.py
+++ b/regression_test.py
@@ -61,6 +61,7 @@ class RegressionTest:
 				arguments = arguments.join(route[1:])
 			file_name = name+arguments
 			url = self.base_url+name+'?filter=min_year:1991,max_year:'+str(maxYear)+','+arguments+'&format=csv'
+			url = url.replace(",&format","&format")
 			try:
 				api_csv = pd.read_csv(url,float_precision='round_trip', encoding="utf-8-sig") #get from api
 				csv_route = pd.read_csv('route_result/'+file_name+'.csv', index_col=0, float_precision='round_trip', encoding="utf-8-sig") #get file