1 files changed, 1 insertions, 1 deletions
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index f5e7a206a56..c31e618520a 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1938,7 +1938,7 @@ private:
   struct FormatTokenLess {
     FormatTokenLess(const SourceManager &SM) : SM(SM) {}
 
-    bool operator()(const FormatToken *LHS, const FormatToken *RHS) {
+    bool operator()(const FormatToken *LHS, const FormatToken *RHS) const {
       return SM.isBeforeInTranslationUnit(LHS->Tok.getLocation(),
                                           RHS->Tok.getLocation());
     }