diff --git a/appveyor.yml b/appveyor.yml
index 7440cb4..0dc903a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -45,7 +45,9 @@
   - msbuild /m /p:Configuration="%CONFIGURATION%" /p:Platform="%PLATFORM%" utest.sln
   - copy %CONFIGURATION%\utest_test.exe utest_test.exe
   - copy %CONFIGURATION%\utest_test_wpo.exe utest_test_wpo.exe
+  - copy %CONFIGURATION%\utest_test_wpo.exe utest_test_mt.exe
 
 test_script:
   - utest_test.exe
   - utest_test_wpo.exe
+  - utest_test_mt.exe

diff --git a/appveyor.yml b/appveyor.yml
index 7440cb4..0dc903a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -45,7 +45,9 @@
   - msbuild /m /p:Configuration="%CONFIGURATION%" /p:Platform="%PLATFORM%" utest.sln
   - copy %CONFIGURATION%\utest_test.exe utest_test.exe
   - copy %CONFIGURATION%\utest_test_wpo.exe utest_test_wpo.exe
+  - copy %CONFIGURATION%\utest_test_wpo.exe utest_test_mt.exe
 
 test_script:
   - utest_test.exe
   - utest_test_wpo.exe
+  - utest_test_mt.exe
diff --git a/utest.h b/utest.h
index 58c83c7..fdfceae 100644
--- a/utest.h
+++ b/utest.h
@@ -68,21 +68,29 @@
 #pragma warning(pop)
 #endif
 
+#if defined(__cplusplus)
+#define UTEST_C_FUNC extern "C"
+#else
+#define UTEST_C_FUNC
+#endif
+
 #if defined(_MSC_VER)
 typedef union {
   struct {
     unsigned long LowPart;
-    long  HighPart;
+    long HighPart;
   } DUMMYSTRUCTNAME;
   struct {
     unsigned long LowPart;
-    long  HighPart;
+    long HighPart;
   } u;
   utest_int64_t QuadPart;
 } utest_large_integer;
 
-__declspec(dllimport) int __stdcall QueryPerformanceCounter(utest_large_integer *);
-__declspec(dllimport) int __stdcall QueryPerformanceFrequency(utest_large_integer *);
+UTEST_C_FUNC __declspec(dllimport) int __stdcall QueryPerformanceCounter(
+    utest_large_integer *);
+UTEST_C_FUNC __declspec(dllimport) int __stdcall QueryPerformanceFrequency(
+    utest_large_integer *);
 #elif defined(__linux__)
 
 /*
@@ -117,12 +125,6 @@
 #define UTEST_PRIu64 "I64u"
 #define UTEST_INLINE __forceinline
 
-#if defined(__cplusplus)
-#define UTEST_C_FUNC extern "C"
-#else
-#define UTEST_C_FUNC
-#endif
-
 #if defined(_WIN64)
 #define UTEST_SYMBOL_PREFIX
 #else