diff --git a/texthook/hookman.h b/texthook/hookman.h
index f2b1241..8b8dbfd 100644
--- a/texthook/hookman.h
+++ b/texthook/hookman.h
@@ -19,8 +19,8 @@ struct ProcessRecord
 	HANDLE hostPipe;
 };
 
-typedef void(*ProcessEventCallback)(DWORD pid);
-typedef void(*ThreadEventCallback)(TextThread*);
+typedef void(__stdcall *ProcessEventCallback)(DWORD pid);
+typedef void(__stdcall *ThreadEventCallback)(TextThread*);
 
 struct ThreadParameterHasher
 {
diff --git a/texthook/textthread.h b/texthook/textthread.h
index be7857e..321096f 100644
--- a/texthook/textthread.h
+++ b/texthook/textthread.h
@@ -25,7 +25,7 @@ struct ThreadParameter
 #define CURRENT_SELECT 0x1000
 
 class TextThread;
-typedef std::wstring(*ThreadOutputCallback)(TextThread*, std::wstring data);
+typedef std::wstring(__stdcall *ThreadOutputCallback)(TextThread*, std::wstring data);
 
 //extern DWORD split_time,repeat_count,global_filter,cyclic_remove;