diff --git a/capsulflask/payment.py b/capsulflask/payment.py
index d621827..c1916de 100644
--- a/capsulflask/payment.py
+++ b/capsulflask/payment.py
@@ -40,9 +40,9 @@ def validate_dollars(min: decimal.Decimal, max: decimal.Decimal):
     #current_app.logger.info(f"{str(dollars)}  {str(min)}  {str(dollars < min)}")
 
     if dollars and dollars < min:
-      errors.append(f"dollars must be {format(min, ".2f")} or more")
+      errors.append(f"dollars must be {format(min, '.2f')} or more")
     elif dollars and dollars >= max:
-      errors.append(f"dollars must be less than {format(max, ".2f")}")
+      errors.append(f"dollars must be less than {format(max, '.2f')}")
 
   current_app.logger.info(f"{len(errors)}  {errors}")
   return [dollars, errors]