diff --git a/packages/taler-util/src/amounts.ts b/packages/taler-util/src/amounts.ts
index a8df3679f..04343b8e9 100644
--- a/packages/taler-util/src/amounts.ts
+++ b/packages/taler-util/src/amounts.ts
@@ -345,9 +345,12 @@ export class Amounts {
 
   /**
    * Parse an amount like 'EUR:20.5' for 20 Euros and 50 ct.
+   * 
+   * Currency name size limit is 11 of ASCII letters
+   * Fraction size limit is 8
    */
   static parse(s: string): AmountJson | undefined {
-    const res = s.match(/^([a-zA-Z0-9_*-]+):([0-9]+)([.][0-9]+)?$/);
+    const res = s.match(/^([a-zA-Z]{1,11}):([0-9]+)([.][0-9]{1,8})?$/);
     if (!res) {
       return undefined;
     }