diff --git a/include/fast_float/ascii_number.h b/include/fast_float/ascii_number.h
index a0edaa9..c91aed3 100644
--- a/include/fast_float/ascii_number.h
+++ b/include/fast_float/ascii_number.h
@@ -564,7 +564,7 @@ parse_int_string(UC const *p, UC const *pend, T &value,
   auto const *const start_digits = p;
 
   FASTFLOAT_IF_CONSTEXPR17((std::is_same<T, std::uint8_t>::value)) {
-    const auto len = static_cast<am_bits_t>(pend - p);
+    const auto len = static_cast<am_digits>(pend - p);
     if (len == 0) {
       if (has_leading_zeros) {
         value = 0;
@@ -608,7 +608,7 @@ parse_int_string(UC const *p, UC const *pend, T &value,
     const uint32_t magic =
         ((digits + 0x46464646u) | (digits - 0x30303030u)) & 0x80808080u;
     const auto tz = countr_zero_32(magic); // 7, 15, 23, 31, or 32
-    am_bits_t nd = (tz == 32) ? 4 : (tz >> 3);
+    am_digits nd = (tz >> 3);
     nd = std::min(nd, len);
     if (nd == 0) {
       if (has_leading_zeros) {