diff --git a/src/CxbxKrnl/CxbxKrnl.cpp b/src/CxbxKrnl/CxbxKrnl.cpp
index f5ba84ae4..ebf79cf09 100644
--- a/src/CxbxKrnl/CxbxKrnl.cpp
+++ b/src/CxbxKrnl/CxbxKrnl.cpp
@@ -36,6 +36,9 @@
 
 #define _XBOXKRNL_DEFEXTRN_
 
+// Default to High Performance Mode on machines with dual graphics
+extern "C" {
	__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;	// AMD
	__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;		// NVIDIA
}
+
 /* prevent name collisions */
 namespace xboxkrnl
 {