diff --git a/src/parser/parse_from_text/phone_numbers.rs b/src/parser/parse_from_text/phone_numbers.rs
index 39ad1be..ef0db1a 100644
--- a/src/parser/parse_from_text/phone_numbers.rs
+++ b/src/parser/parse_from_text/phone_numbers.rs
@@ -20,7 +20,7 @@ fn is_sdd(input: char) -> bool {
 }
 
 fn is_digit(input: char) -> bool {
-    input.is_digit(10)
+    input.is_ascii_digit()
 }
 
 fn is_digit_or_ssd(input: char) -> bool {