diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index c3f03a86f..934d07ebd 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -5,10 +5,6 @@
 #elif _WIN32
 #include <Windows.h>
 #pragma comment(lib, "user32.lib")
-extern "C" {
-__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
-__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
-}
 #endif
 
 namespace Slic3r { namespace GUI {