diff --git a/modules/ocl/src/cl_context.cpp b/modules/ocl/src/cl_context.cpp
index 258ed91e51a7..d78d345197ce 100644
--- a/modules/ocl/src/cl_context.cpp
+++ b/modules/ocl/src/cl_context.cpp
@@ -757,6 +757,9 @@ __Module::~__Module()
 
 #if defined(WIN32) && defined(CVAPI_EXPORTS)
 
+extern "C"
+BOOL WINAPI DllMain(HINSTANCE /*hInst*/, DWORD fdwReason, LPVOID lpReserved);
+
 extern "C"
 BOOL WINAPI DllMain(HINSTANCE /*hInst*/, DWORD fdwReason, LPVOID lpReserved)
 {