diff --git a/app/models/deposit.rb b/app/models/deposit.rb
index a3b898047..2eff26bcc 100644
--- a/app/models/deposit.rb
+++ b/app/models/deposit.rb
@@ -29,7 +29,7 @@ class Deposit
 
   def amount
     return BigDecimal('0.0') if @amount.blank?
-    BigDecimal(@amount.to_s.gsub(/,/, '.'), 10)
+    BigDecimal(@amount.to_s.tr(',', '.'), 10)
   end
 
   def issue_prepayment_invoice