diff --git a/clang/lib/Analysis/FormatStringParsing.h b/clang/lib/Analysis/FormatStringParsing.h
index e165296..8463fce 100644
--- a/clang/lib/Analysis/FormatStringParsing.h
+++ b/clang/lib/Analysis/FormatStringParsing.h
@@ -46,7 +46,13 @@
 /// FormatSpecifier& argument, and false otherwise.
 bool ParseLengthModifier(FormatSpecifier &FS, const char *&Beg, const char *E,
                          const LangOptions &LO, bool IsScanf = false);
-  
+
+/// Returns true if the invalid specifier in \p SpecifierBegin is a UTF-8
+/// string; check that it won't go further than \p FmtStrEnd and write
+/// up the total size in \p Len.
+bool ParseUTF8InvalidSpecifier(const char *SpecifierBegin,
+                               const char *FmtStrEnd, unsigned &Len);
+
 template <typename T> class SpecifierResult {
   T FS;
   const char *Start;