diff --git a/utils/TableGen/FastISelEmitter.h b/utils/TableGen/FastISelEmitter.h
index f34ece81b95..df6a0e655cc 100644
--- a/utils/TableGen/FastISelEmitter.h
+++ b/utils/TableGen/FastISelEmitter.h
@@ -16,7 +16,6 @@
 
 #include "TableGenBackend.h"
 #include "CodeGenDAGPatterns.h"
-#include <set>
 
 namespace llvm {