diff --git a/bills.py b/bills.py
index a6b38fe..2e35177 100644
--- a/bills.py
+++ b/bills.py
@@ -304,7 +304,7 @@ def get_growth_value( bt, bill_type ):
         finance_data = get_finance_data()
         return finance_data['Inflation']
     else: 
-        match = re.match("flat-(\d+)", which )
+        match = re.match(r"flat-(\d+)", which )
         if match:
             return int(match.group(1))
         else: