diff --git a/stl/inc/charconv b/stl/inc/charconv
index 20d8342c41b..9ab5d01ec81 100644
--- a/stl/inc/charconv
+++ b/stl/inc/charconv
@@ -127,6 +127,17 @@ _NODISCARD to_chars_result _Integer_to_chars(
         } while (_Value != 0);
         break;
 
+    case 3:
+    case 5:
+    case 6:
+    case 7:
+    case 9:
+        do {
+            *--_RNext = static_cast<char>('0' + _Value % _Base);
+            _Value    = static_cast<_Unsigned>(_Value / _Base);
+        } while (_Value != 0);
+        break;
+
     default:
         do {
             *--_RNext = _Charconv_digits[_Value % _Base];