diff --git a/include/fmt/format.h b/include/fmt/format.h
index 81170881..c4b5585d 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -1249,7 +1249,7 @@ FMT_CONSTEXPR20 auto do_format_decimal(Char* out, UInt value, int size)
   while (value >= 100) {
     n -= 2;
     if (!is_constant_evaluated() && sizeof(UInt) == 4) {
-      auto p = value * ((1ull << 39) / 100 + 1);
+      auto p = value * static_cast<uint64_t>((1ull << 39) / 100 + 1);
       write2digits_i(out + n, p >> (39 - 7) & ((1 << 7) - 1));
       value = static_cast<UInt>(p >> 39) +
               (static_cast<UInt>(value >= (100u << 25)) << 25);