diff --git a/include/clang/Lex/PreprocessorLexer.h b/include/clang/Lex/PreprocessorLexer.h
index 12a0cef..bbe6dbe 100644
--- a/include/clang/Lex/PreprocessorLexer.h
+++ b/include/clang/Lex/PreprocessorLexer.h
@@ -60,6 +60,7 @@
   friend class Preprocessor;
   
   PreprocessorLexer() {}
+  virtual ~PreprocessorLexer();
   
   virtual void IndirectLex(Token& Result) = 0;
   
diff --git a/lib/Lex/PreprocessorLexer.cpp b/lib/Lex/PreprocessorLexer.cpp
index cbda79f..f3d91af 100644
--- a/lib/Lex/PreprocessorLexer.cpp
+++ b/lib/Lex/PreprocessorLexer.cpp
@@ -18,6 +18,8 @@
 
 using namespace clang;
 
+PreprocessorLexer::~PreprocessorLexer() {}
+
 /// LexIncludeFilename - After the preprocessor has parsed a #include, lex and
 /// (potentially) macro expand the filename.
 void PreprocessorLexer::LexIncludeFilename(Token &FilenameTok) {