diff --git a/llvm/include/llvm/Transforms/Scalar/Float2Int.h b/llvm/include/llvm/Transforms/Scalar/Float2Int.h
--- a/llvm/include/llvm/Transforms/Scalar/Float2Int.h
+++ b/llvm/include/llvm/Transforms/Scalar/Float2Int.h
@@ -16,6 +16,7 @@
 
 #include "llvm/ADT/EquivalenceClasses.h"
 #include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/SetVector.h"
 #include "llvm/IR/ConstantRange.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
@@ -30,7 +31,7 @@
   bool runImpl(Function &F, const DominatorTree &DT);
 
 private:
-  using RootSet = SmallPtrSet<Instruction *, 8>;
+  using RootSet = SmallSetVector<Instruction *, 8>;
 
   void findRoots(Function &F, const DominatorTree &DT,
                  RootSet &Roots);