diff --git a/Sources/Platform/EFI/EfiAsm.asm b/Sources/Platform/EFI/EfiAsm.asm
index ad3380c..c7110da 100644
--- a/Sources/Platform/EFI/EfiAsm.asm
+++ b/Sources/Platform/EFI/EfiAsm.asm
@@ -49,8 +49,8 @@ endm
 ; @brief The default host exception handlers.
 ;
 ; @details This is the function containing actually 256 stub functions generated
-; with the INTERRUPT_HANDLER and INTERRUPT_HANDLER_WITH_CODE macros. Each function
-; works as a hendler of the corresponding interrupt/exception in the host.
+;   with the INTERRUPT_HANDLER and INTERRUPT_HANDLER_WITH_CODE macros. Each function
+;   works as a hendler of the corresponding interrupt/exception in the host.
 ;
 AsmDefaultExceptionHandlers proc
     repeat 8
diff --git a/Sources/Platform/EFI/EfiCommon.h b/Sources/Platform/EFI/EfiCommon.h
index 0f4f5f9..f6ee8e5 100644
--- a/Sources/Platform/EFI/EfiCommon.h
+++ b/Sources/Platform/EFI/EfiCommon.h
@@ -75,6 +75,7 @@ void __writedr(unsigned int, unsigned __int64);
 void __writemsr(unsigned long, unsigned __int64);
 void _lgdt(void *);
 void _sgdt(void *);
+void _xsetbv(unsigned int, unsigned __int64);
 
 //
 // MSVC compatibility macro definitions.