diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index b1f860d6b64a8..8b0f3047a0a8b 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -2224,6 +2224,47 @@ impl ToString for char {
     }
 }
 
+#[stable(feature = "u8_to_string_specialization", since = "1.999.0")]
+impl ToString for u8 {
+    #[inline]
+    fn to_string(&self) -> String {
+        let mut buf = String::with_capacity(3);
+        let mut n = *self;
+        if n >= 10 {
+            if n >= 100 {
+                buf.push((b'0' + n / 100) as char);
+                n %= 100;
+            }
+            buf.push((b'0' + n / 10) as char);
+            n %= 10;
+        }
+        buf.push((b'0' + n) as char);
+        buf
+    }
+}
+
+#[stable(feature = "i8_to_string_specialization", since = "1.999.0")]
+impl ToString for i8 {
+    #[inline]
+    fn to_string(&self) -> String {
+        let mut buf = String::with_capacity(4);
+        if self.is_negative() {
+            buf.push('-');
+        }
+        let mut n = self.unsigned_abs();
+        if n >= 10 {
+            if n >= 100 {
+                buf.push('1');
+                n -= 100;
+            }
+            buf.push((b'0' + n / 10) as char);
+            n %= 10;
+        }
+        buf.push((b'0' + n) as char);
+        buf
+    }
+}
+
 #[stable(feature = "str_to_string_specialization", since = "1.9.0")]
 impl ToString for str {
     #[inline]