diff --git a/basicswap/ui/util.py b/basicswap/ui/util.py
index 70be243..13f8172 100644
--- a/basicswap/ui/util.py
+++ b/basicswap/ui/util.py
@@ -55,7 +55,7 @@ def validateAmountString(amount, ci):
 
 def inputAmount(amount_str, ci):
     validateAmountString(amount_str, ci)
-    return make_int(amount_str, ci.exp())
+    return make_int(amount_str, ci.exp(), r=1)
 
 
 def get_data_entry_or(post_data, name, default):