diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index b018603b314..e53c179e793 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -18,6 +18,7 @@
 
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/Support/DebugLoc.h"
+#include "llvm/System/DataTypes.h"
 
 namespace llvm {
   class BlockAddress;