diff --git a/src/catch2/internal/catch_main.cpp b/src/catch2/internal/catch_main.cpp
index 940ac3bc..ed89ab6e 100644
--- a/src/catch2/internal/catch_main.cpp
+++ b/src/catch2/internal/catch_main.cpp
@@ -20,7 +20,7 @@ namespace Catch {
 
 #if defined(CATCH_CONFIG_WCHAR) && defined(CATCH_PLATFORM_WINDOWS) && defined(_UNICODE) && !defined(DO_NOT_USE_WMAIN)
 // Standard C/C++ Win32 Unicode wmain entry point
-extern "C" int wmain (int argc, wchar_t * argv[], wchar_t * []) {
+extern "C" int __cdecl wmain (int argc, wchar_t * argv[], wchar_t * []) {
 #else
 // Standard C/C++ main entry point
 int main (int argc, char * argv[]) {