diff --git a/clang/lib/Format/UnwrappedLineParser.h b/clang/lib/Format/UnwrappedLineParser.h
index 92a51abf10ee..908391d3db7b 100644
--- a/clang/lib/Format/UnwrappedLineParser.h
+++ b/clang/lib/Format/UnwrappedLineParser.h
@@ -79,6 +79,8 @@ public:
 
 class FormatTokenSource {
 public:
+  virtual ~FormatTokenSource() {
+  }
   virtual FormatToken getNextToken() = 0;
 };