diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 21fb8cffc7f..dccabda1b57 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -14,7 +14,7 @@
 
 #include "llvm/ADT/APInt.h"
 
-#if 1
+#if 0
 #include "llvm/DerivedTypes.h"
 #include "llvm/Support/MathExtras.h"
 #include <cstring>