diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 98d1fb4..a30c950 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -50,7 +50,7 @@
 }
 
 unsigned X86_64TargetMachine::getJITMatchQuality() {
-#if defined(__x86_64__)
+#if defined(__x86_64__) || defined(_M_AMD64)
   return 10;
 #endif
   return 0;