diff --git a/llvm/lib/CodeGen/InstrSched/SchedGraphCommon.cpp b/llvm/lib/CodeGen/InstrSched/SchedGraphCommon.cpp
index 3ab79f7..da4492f 100644
--- a/llvm/lib/CodeGen/InstrSched/SchedGraphCommon.cpp
+++ b/llvm/lib/CodeGen/InstrSched/SchedGraphCommon.cpp
@@ -14,6 +14,7 @@
 
 #include "llvm/CodeGen/SchedGraphCommon.h"
 #include "Support/STLExtras.h"
+#include <iostream>
 
 namespace llvm {