diff --git a/core/src/types/uint.rs b/core/src/types/uint.rs
index 3e2ea7e1022..51f3fece09d 100644
--- a/core/src/types/uint.rs
+++ b/core/src/types/uint.rs
@@ -49,7 +49,7 @@ impl<'de> serde::Deserialize<'de> for Uint {
         let digits = amount_string
             .chars()
             .filter_map(|c| {
-                if c.is_numeric() {
+                if c.is_digit(10) {
                     c.to_digit(10).map(Uint::from)
                 } else {
                     None