diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 73806a6..bb0da18 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -24,7 +24,6 @@
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/DeclarationName.h"
-#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
@@ -33,6 +32,8 @@
 
 namespace llvm {
   class APSInt;
+  template <typename ValueT> struct DenseMapInfo;
+  template <typename ValueT, typename ValueInfoT> class DenseSet;
 }
 
 namespace clang {
@@ -1534,6 +1535,8 @@
   bool isPropertyReadonly(ObjCPropertyDecl *PropertyDecl,
                           ObjCInterfaceDecl *IDecl);
 
+  typedef llvm::DenseSet<Selector, llvm::DenseMapInfo<Selector> > SelectorSet;
+
   /// CheckProtocolMethodDefs - This routine checks unimplemented
   /// methods declared in protocol, and those referenced by it.
   /// \param IDecl - Used for checking for methods which may have been
@@ -1541,8 +1544,8 @@
   void CheckProtocolMethodDefs(SourceLocation ImpLoc,
                                ObjCProtocolDecl *PDecl,
                                bool& IncompleteImpl,
-                               const llvm::DenseSet<Selector> &InsMap,
-                               const llvm::DenseSet<Selector> &ClsMap,
+                               const SelectorSet &InsMap,
+                               const SelectorSet &ClsMap,
                                ObjCContainerDecl *CDecl);
 
   /// CheckImplementationIvars - This routine checks if the instance variables
@@ -1561,7 +1564,7 @@
   /// which must be implemented by this implementation.
   void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
                                        ObjCContainerDecl *CDecl,
-                                       const llvm::DenseSet<Selector>& InsMap);
+                                       const SelectorSet &InsMap);
 
   /// DefaultSynthesizeProperties - This routine default synthesizes all 
   /// properties which must be synthesized in class's @implementation.
@@ -1627,10 +1630,10 @@
 
   /// MatchAllMethodDeclarations - Check methods declaraed in interface or
   /// or protocol against those declared in their implementations.
-  void MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap,
-                                  const llvm::DenseSet<Selector> &ClsMap,
-                                  llvm::DenseSet<Selector> &InsMapSeen,
-                                  llvm::DenseSet<Selector> &ClsMapSeen,
+  void MatchAllMethodDeclarations(const SelectorSet &InsMap,
+                                  const SelectorSet &ClsMap,
+                                  SelectorSet &InsMapSeen,
+                                  SelectorSet &ClsMapSeen,
                                   ObjCImplDecl* IMPDecl,
                                   ObjCContainerDecl* IDecl,
                                   bool &IncompleteImpl,
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 9537ea0..9fed285 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -29,6 +29,7 @@
 #include "clang/Sema/ParsedTemplate.h"
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/STLExtras.h"
 #include <map>
 #include <set>
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index e51ce13..b4acfbd 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -19,6 +19,8 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/Sema/DeclSpec.h"
+#include "llvm/ADT/DenseSet.h"
+
 using namespace clang;
 
 /// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible
diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 0e6a6a4..8c8c007 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -26,6 +26,7 @@
 #include "clang/AST/ExprCXX.h"
 #include "clang/Basic/Builtins.h"
 #include "clang/Basic/LangOptions.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/ErrorHandling.h"
diff --git a/lib/Sema/SemaObjCProperty.cpp b/lib/Sema/SemaObjCProperty.cpp
index b9fd4a0..6e273f5 100644
--- a/lib/Sema/SemaObjCProperty.cpp
+++ b/lib/Sema/SemaObjCProperty.cpp
@@ -16,6 +16,7 @@
 #include "clang/Sema/Initialization.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/ExprObjC.h"
+#include "llvm/ADT/DenseSet.h"
 
 using namespace clang;