diff --git a/include/fast_float/ascii_number.h b/include/fast_float/ascii_number.h
index 0b38139..bc44912 100644
--- a/include/fast_float/ascii_number.h
+++ b/include/fast_float/ascii_number.h
@@ -434,7 +434,7 @@ parse_number_string(UC const *p, UC const *pend,
         if (exp_number < 0x1000) {
           // check for exponent overflow if we have too many digits.
           UC const digit = UC(*p - UC('0'));
-          exp_number = 10 * exp_number + digit;
+          exp_number = 10 * exp_number + static_cast<am_pow_t>(digit);
         }
         ++p;
       }
diff --git a/include/fast_float/parse_number.h b/include/fast_float/parse_number.h
index 6e56b95..b764540 100644
--- a/include/fast_float/parse_number.h
+++ b/include/fast_float/parse_number.h
@@ -364,7 +364,9 @@ from_chars(UC const *first, UC const *last, T &value, int const base) noexcept {
   static_assert(is_supported_char_type<UC>::value,
                 "only char, wchar_t, char16_t and char32_t are supported");
 
-  parse_options_t<UC> const options(chars_format::general, UC('.'), base);
+  parse_options_t<UC> const options(
+      static_cast<chars_format_t>(chars_format::general), UC('.'),
+      static_cast<uint_fast8_t>(base));
   return from_chars_advanced(first, last, value, options);
 }