diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs
index 2baea7842a796..64ae7db0d9b53 100644
--- a/library/core/src/char/methods.rs
+++ b/library/core/src/char/methods.rs
@@ -1,5 +1,6 @@
 //! impl char {}
 
+use crate::intrinsics::likely;
 use crate::slice;
 use crate::str::from_utf8_unchecked_mut;
 use crate::unicode::printable::is_printable;
@@ -331,14 +332,11 @@ impl char {
     #[inline]
     pub fn to_digit(self, radix: u32) -> Option<u32> {
         assert!(radix <= 36, "to_digit: radix is too high (maximum 36)");
-
         // the code is split up here to improve execution speed for cases where
         // the `radix` is constant and 10 or smaller
-        let val = if radix <= 10 {
-            match self {
-                '0'..='9' => self as u32 - '0' as u32,
-                _ => return None,
-            }
+        let val = if likely(radix <= 10) {
+            // If not a digit, a number greater than radix will be created.
+            (self as u32).wrapping_sub('0' as u32)
         } else {
             match self {
                 '0'..='9' => self as u32 - '0' as u32,