diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h
index 01fe6452560..397a5d8043d 100644
--- a/include/llvm/CodeGen/SelectionDAGISel.h
+++ b/include/llvm/CodeGen/SelectionDAGISel.h
@@ -18,7 +18,6 @@
 #include "llvm/Pass.h"
 #include "llvm/Constant.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
-#include <set>
 
 namespace llvm {
   class SelectionDAG;