1 files changed, 2 insertions, 2 deletions
diff --git a/include/clang/Lex/MacroInfo.h b/include/clang/Lex/MacroInfo.h
index 6cc3b0bb26f2c..44b7b2e4a474b 100644
--- a/include/clang/Lex/MacroInfo.h
+++ b/include/clang/Lex/MacroInfo.h
@@ -126,7 +126,7 @@ public:
   SourceLocation getDefinitionEndLoc() const { return EndLocation; }
 
   /// \brief Get length in characters of the macro definition.
-  unsigned getDefinitionLength(SourceManager &SM) const {
+  unsigned getDefinitionLength(const SourceManager &SM) const {
     if (IsDefinitionLengthCached)
       return DefinitionLength;
     return getDefinitionLengthSlow(SM);
@@ -285,7 +285,7 @@ public:
   void dump() const;
 
 private:
-  unsigned getDefinitionLengthSlow(SourceManager &SM) const;
+  unsigned getDefinitionLengthSlow(const SourceManager &SM) const;
 
   void setOwningModuleID(unsigned ID) {
     assert(isFromASTFile());