diff --git a/.github/workflows/msys2-clang.yml b/.github/workflows/msys2-clang.yml
index 44ee983..21a2abd 100644
--- a/.github/workflows/msys2-clang.yml
+++ b/.github/workflows/msys2-clang.yml
@@ -50,7 +50,7 @@ jobs:
           install: ${{ matrix.install }}
 
       - name: Install dependencies
-        run: script/ci_install_deps.sh && clang++ -dM -E - < /dev/null
+        run: script/ci_install_deps.sh
 
       - name: Configure
         run: cmake -DCMAKE_CXX_COMPILER=clang++ -S test -B build -DCMAKE_BUILD_TYPE=Debug
diff --git a/include/ss/extract.hpp b/include/ss/extract.hpp
index 0c0c3e1..e6f65f0 100644
--- a/include/ss/extract.hpp
+++ b/include/ss/extract.hpp
@@ -35,12 +35,13 @@ inline std::optional<short> from_char(char c) {
     return std::nullopt;
 }
 
-#define MING32_CLANG                                                           \
-    defined(__clang__) && defined(__MINGW32__) && !defined(__MINGW64__)
+#if defined(__clang__) && defined(__MINGW32__) && !defined(__MINGW64__)
+#define MINGW32_CLANG
+#endif
 
 // mingw32 clang does not support some of the builtin functions
 #if (defined(__clang__) || defined(__GNUC__) || defined(__GUNG__)) &&          \
-    (MING32_CLANG == false)
+    !defined(MINGW32_CLANG)
 #warning "using mul functions"
 ////////////////
 // mul overflow detection
@@ -200,7 +201,7 @@ std::enable_if_t<std::is_integral_v<T>, std::optional<T>> to_num(
     }
 
 #if (defined(__clang__) || defined(__GNUC__) || defined(__GUNG__)) &&          \
-    (MING32_CLANG == false)
+    !defined(MINGW32_CLANG)
     auto add_last_digit_owerflow =
         (is_negative) ? sub_overflow<T> : add_overflow<T>;
 #else