diff --git a/tools/llvmc2/CompilationGraph.h b/tools/llvmc2/CompilationGraph.h
index 6b2b290..41731a3 100644
--- a/tools/llvmc2/CompilationGraph.h
+++ b/tools/llvmc2/CompilationGraph.h
@@ -16,13 +16,13 @@
 
 #include "AutoGenerated.h"
 #include "Tool.h"
-#include "StringSet.h"
 
 #include "llvm/ADT/GraphTraits.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/iterator.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/System/Path.h"
 
 #include <cassert>
@@ -30,7 +30,7 @@
 
 namespace llvmc {
 
-  typedef StringSet<> InputLanguagesSet;
+  typedef llvm::StringSet<> InputLanguagesSet;
 
   /// Edge - Represents an edge of the compilation graph.
   class Edge : public llvm::RefCountedBaseVPTR<Edge> {
diff --git a/tools/llvmc2/StringSet.h b/tools/llvmc2/StringSet.h
deleted file mode 100644
index d9556cc..0000000
--- a/tools/llvmc2/StringSet.h
+++ /dev/null
@@ -1,40 +0,0 @@
-//===--- StringSet.h - The LLVM Compiler Driver -----------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  StringSet - A set-like wrapper for the StringMap.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_TOOLS_LLVMC2_STRINGSET_H
-#define LLVM_TOOLS_LLVMC2_STRINGSET_H
-
-#include "llvm/ADT/StringMap.h"
-
-#include <cassert>
-
-namespace llvmc {
-
-  /// StringSet - A wrapper for StringMap that provides set-like
-  /// functionality.  Only insert() and count() methods are used by my
-  /// code.
-  template <class AllocatorTy = llvm::MallocAllocator>
-  class StringSet : public llvm::StringMap<char, AllocatorTy> {
-    typedef llvm::StringMap<char, AllocatorTy> base;
-  public:
-    void insert (const std::string& InLang) {
-      assert(!InLang.empty());
-      const char* KeyStart = &InLang[0];
-      const char* KeyEnd = KeyStart + InLang.size();
-      base::insert(llvm::StringMapEntry<char>::
-                   Create(KeyStart, KeyEnd, base::getAllocator(), '+'));
-    }
-  };
-}
-
-#endif //LLVM_TOOLS_LLVMC2_STRINGSET_H
diff --git a/tools/llvmc2/Tool.h b/tools/llvmc2/Tool.h
index 3527817..294c6fb 100644
--- a/tools/llvmc2/Tool.h
+++ b/tools/llvmc2/Tool.h
@@ -15,9 +15,9 @@
 #define LLVM_TOOLS_LLVMC2_TOOL_H
 
 #include "Action.h"
-#include "StringSet.h"
 
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/System/Path.h"
 
 #include <string>
@@ -26,6 +26,7 @@
 namespace llvmc {
 
   typedef std::vector<llvm::sys::Path> PathVector;
+  typedef llvm::StringSet<> InputLanguagesSet;
 
   /// Tool - A class
   class Tool : public llvm::RefCountedBaseVPTR<Tool> {
@@ -35,11 +36,11 @@
 
     virtual Action GenerateAction (const PathVector& inFiles,
                                    const llvm::sys::Path& outFile,
-                                   const StringSet<>& InLangs) const = 0;
+                                   const InputLanguagesSet& InLangs) const = 0;
 
     virtual Action GenerateAction (const llvm::sys::Path& inFile,
                                    const llvm::sys::Path& outFile,
-                                   const StringSet<>& InLangs) const = 0;
+                                   const InputLanguagesSet& InLangs) const = 0;
 
     virtual const char* Name() const = 0;
     virtual const char* InputLanguage() const = 0;
@@ -58,7 +59,7 @@
     bool JoinListEmpty() const { return JoinList_.empty(); }
 
     Action GenerateAction(const llvm::sys::Path& outFile,
-                          const StringSet<>& InLangs) const {
+                          const InputLanguagesSet& InLangs) const {
       return GenerateAction(JoinList_, outFile, InLangs);
     }
     // We shouldn't shadow base class's version of GenerateAction.