diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.h b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.h
index 43d1a43..78068e0 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.h
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.h
@@ -98,7 +98,7 @@
     }
   } FileNameRegistry;
 
-  typedef std::map<std::pair<StringRef, StringRef>, char *>
+  typedef std::map<std::pair<StringRef, StringRef>, std::string>
       DirAndFilenameToFilepathMapTy;
   DirAndFilenameToFilepathMapTy DirAndFilenameToFilepathMap;
   StringRef getFullFilepath(const MDNode *S);
@@ -116,14 +116,6 @@
 public:
   WinCodeViewLineTables(AsmPrinter *Asm);
 
-  ~WinCodeViewLineTables() override {
-    for (DirAndFilenameToFilepathMapTy::iterator
-             I = DirAndFilenameToFilepathMap.begin(),
-             E = DirAndFilenameToFilepathMap.end();
-         I != E; ++I)
-      free(I->second);
-  }
-
   void setSymbolSize(const llvm::MCSymbol *, uint64_t) override {}
 
   /// \brief Emit the COFF section that holds the line table information.