diff --git a/.github/workflows/vs16-arm-ci.yml b/.github/workflows/vs16-arm-ci.yml
new file mode 100644
index 0000000..7c69e38
--- /dev/null
+++ b/.github/workflows/vs16-arm-ci.yml
@@ -0,0 +1,21 @@
+name: VS16-ARM-CI
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    name: windows-vs16
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {arch: ARM}
+          - {arch: ARM64}
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Use cmake
+        run: |
+          cmake -A ${{ matrix.arch }} -DCMAKE_CROSSCOMPILING=1 -DFASTFLOAT_TEST=ON -B build  &&
+          cmake --build build --verbose
\ No newline at end of file
diff --git a/include/fast_float/float_common.h b/include/fast_float/float_common.h
index 22b721d..d949b6d 100644
--- a/include/fast_float/float_common.h
+++ b/include/fast_float/float_common.h
@@ -129,23 +129,21 @@ fastfloat_really_inline int leading_zeroes(uint64_t input_num) {
 
 #ifdef FASTFLOAT_32BIT
 
-#if (!defined(_WIN32)) || defined(__MINGW32__)
 // slow emulation routine for 32-bit
-fastfloat_really_inline uint64_t __emulu(uint32_t x, uint32_t y) {
+fastfloat_really_inline uint64_t emulu(uint32_t x, uint32_t y) {
     return x * (uint64_t)y;
 }
-#endif
 
 // slow emulation routine for 32-bit
 #if !defined(__MINGW64__)
 fastfloat_really_inline uint64_t _umul128(uint64_t ab, uint64_t cd,
                                           uint64_t *hi) {
-  uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
-  uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
-  uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
+  uint64_t ad = emulu((uint32_t)(ab >> 32), (uint32_t)cd);
+  uint64_t bd = emulu((uint32_t)ab, (uint32_t)cd);
+  uint64_t adbc = ad + emulu((uint32_t)ab, (uint32_t)(cd >> 32));
   uint64_t adbc_carry = !!(adbc < ad);
   uint64_t lo = bd + (adbc << 32);
-  *hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
+  *hi = emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
         (adbc_carry << 32) + !!(lo < bd);
   return lo;
 }
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e370559..6b703e0 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -6,7 +6,7 @@ include(FetchContent)
 
 FetchContent_Declare(doctest
   GIT_REPOSITORY https://github.com/onqtam/doctest.git
-  GIT_TAG 2.4.1)
+  GIT_TAG 2.4.6)
 FetchContent_Declare(supplemental_test_files
   GIT_REPOSITORY https://github.com/fastfloat/supplemental_test_files.git
   GIT_TAG origin/main)
@@ -33,6 +33,9 @@ target_compile_definitions(supplemental-data INTERFACE SUPPLEMENTAL_TEST_DATA_DI
 function(fast_float_add_cpp_test TEST_NAME)
     add_executable(${TEST_NAME} ${TEST_NAME}.cpp)
     add_test(${TEST_NAME} ${TEST_NAME})
+    if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+      target_compile_options(${TEST_NAME} PUBLIC /EHsc)
+    endif()
     if(NOT WIN32)
       target_compile_options(${TEST_NAME} PUBLIC -Werror -Wall -Wextra -Weffc++)
       target_compile_options(${TEST_NAME} PUBLIC -Wsign-compare -Wshadow -Wwrite-strings -Wpointer-arith -Winit-self -Wconversion -Wsign-conversion)
diff --git a/tests/basictest.cpp b/tests/basictest.cpp
index 5608e21..13ba167 100644
--- a/tests/basictest.cpp
+++ b/tests/basictest.cpp
@@ -477,9 +477,13 @@ TEST_CASE("32bit.general") {
   verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",655), 0x1.2ced3p+0f);
   verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",656), 0x1.2ced3p+0f);
   verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",1000), 0x1.2ced3p+0f);
-  verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",655) + "e-38", 0x1.fffff8p-127f);
-  verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",656) + "e-38", 0x1.fffff8p-127f);
-  verify(append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",1000) + "e-38", 0x1.fffff8p-127f);
+  std::string test_string;
+  test_string = append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",655) + std::string("e-38");
+  verify(test_string, 0x1.fffff8p-127f);
+  test_string = append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",656) + std::string("e-38");
+  verify(test_string, 0x1.fffff8p-127f);
+  test_string = append_zeros("1.1754941406275178592461758986628081843312458647327962400313859427181746759860647699724722770042717456817626953125",1000) + std::string("e-38");
+  verify(test_string, 0x1.fffff8p-127f);
   verify32(1.00000006e+09f);
   verify32(1.4012984643e-45f);
   verify32(1.1754942107e-38f);