diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index ca3d08fa2cd9..2ea3b07a291c 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1902,8 +1902,9 @@ tooling::Replacements reformat(const FormatStyle &Style, StringRef Code,
       IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
       new DiagnosticOptions);
   SourceManager SourceMgr(Diagnostics, Files);
-  InMemoryFileSystem->addFile(FileName, 0,
-                              llvm::MemoryBuffer::getMemBuffer(Code, FileName));
+  InMemoryFileSystem->addFile(
+      FileName, 0, llvm::MemoryBuffer::getMemBuffer(
+                       Code, FileName, /*RequiresNullTerminator=*/false));
   FileID ID = SourceMgr.createFileID(Files.getFile(FileName), SourceLocation(),
                                      clang::SrcMgr::C_User);
   SourceLocation StartOfFile = SourceMgr.getLocForStartOfFile(ID);