diff --git a/include/fast_float/parse_number.h b/include/fast_float/parse_number.h
index 1340a0d..b5f92ce 100644
--- a/include/fast_float/parse_number.h
+++ b/include/fast_float/parse_number.h
@@ -135,7 +135,12 @@ from_chars_result from_chars_advanced(const char *first, const char *last,
     // We do not have that fegetround() == FE_TONEAREST.
     // Next is a modified Clinger's fast path, inspired by Jakub Jelínek's proposal
     if (pns.exponent >= 0 && pns.exponent <= binary_format<T>::max_exponent_fast_path() && pns.mantissa <=binary_format<T>::max_mantissa_fast_path(pns.exponent) && !pns.too_many_digits) {
+#if (defined(_WIN32) && defined(__clang__))
+      // 32-bit ClangCL maps 0 to -0.0 when fegetround() == FE_DOWNWARD
+      value = pns.mantissa ? T(pns.mantissa) : 0.0;
+#else
       value = T(pns.mantissa);
+#endif
       value = value * binary_format<T>::exact_power_of_ten(pns.exponent);
       if (pns.negative) { value = -value; }
       return answer;
diff --git a/tests/basictest.cpp b/tests/basictest.cpp
index d79fb82..980ead1 100644
--- a/tests/basictest.cpp
+++ b/tests/basictest.cpp
@@ -98,6 +98,36 @@ const char * round_name(int d) {
 
 }
 
+
+TEST_CASE("parse_zero") {
+  //
+  // If this function fails, we may be left in a non-standard rounding state.
+  //
+  const char * zero = "0";
+  double f = 0;
+  fesetround(FE_UPWARD);
+  auto r1 = fast_float::from_chars(zero, zero + 1, f);
+  CHECK(r1.ec == std::errc());
+  std::cout << "FE_UPWARD parsed zero as " << iHexAndDec(f) << std::endl;
+  CHECK(f == 0);
+  fesetround(FE_TOWARDZERO);
+  auto r2 = fast_float::from_chars(zero, zero + 1, f);
+  CHECK(r2.ec == std::errc());
+  std::cout << "FE_TOWARDZERO parsed zero as " << iHexAndDec(f) << std::endl;
+  CHECK(f == 0);
+  fesetround(FE_DOWNWARD);
+  auto r3 = fast_float::from_chars(zero, zero + 1, f);
+  CHECK(r3.ec == std::errc());
+  std::cout << "FE_DOWNWARD parsed zero as " << iHexAndDec(f) << std::endl;
+  CHECK(f == 0);
+  fesetround(FE_TONEAREST);
+  auto r4 = fast_float::from_chars(zero, zero + 1, f);
+  CHECK(r4.ec == std::errc());
+  std::cout << "FE_TONEAREST parsed zero as " << iHexAndDec(f) << std::endl;
+  CHECK(f == 0);
+}
+
+
 // return true on success
 bool check_file(std::string file_name) {
   std::cout << "Checking " << file_name << std::endl;