diff --git a/Contrib/BgImage/BgImage.cpp b/Contrib/BgImage/BgImage.cpp
index 5105bee4..0ca57657 100644
--- a/Contrib/BgImage/BgImage.cpp
+++ b/Contrib/BgImage/BgImage.cpp
@@ -637,7 +637,7 @@ int __stdcall myatoi(char *s)
   return (int)v;
 }
 
-BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) {
+extern "C" BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) {
   g_hInstance=hInst;
   switch (ul_reason_for_call) {
     case DLL_PROCESS_ATTACH:
diff --git a/Contrib/Library/TypeLib/TypeLib.cpp b/Contrib/Library/TypeLib/TypeLib.cpp
index 39a7be1f..e1a401d8 100644
--- a/Contrib/Library/TypeLib/TypeLib.cpp
+++ b/Contrib/Library/TypeLib/TypeLib.cpp
@@ -10,7 +10,7 @@
 
 #define NSISFunction(funcname) extern "C" void __declspec(dllexport) funcname(HWND hwndParent, int string_size, char *variables, stack_t **stacktop)
 
-BOOL WINAPI DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) {
+extern "C" BOOL WINAPI DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) {
 	return TRUE;
 }
 
diff --git a/Contrib/NSISdl/nsisdl.cpp b/Contrib/NSISdl/nsisdl.cpp
index c361f429..8336cb9d 100644
--- a/Contrib/NSISdl/nsisdl.cpp
+++ b/Contrib/NSISdl/nsisdl.cpp
@@ -190,7 +190,7 @@ static LRESULT CALLBACK ParentWndProc(HWND hwnd, UINT message, WPARAM wParam, LP
   return 0;
 }
 
-BOOL APIENTRY DllMain(HINSTANCE _hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
+extern "C" BOOL APIENTRY DllMain(HINSTANCE _hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
 {
   hModule = _hModule;
   return TRUE;