diff --git a/include/llvm/MC/MCContext.h b/include/llvm/MC/MCContext.h
index fbfde5e3f44..d2397154b47 100644
--- a/include/llvm/MC/MCContext.h
+++ b/include/llvm/MC/MCContext.h
@@ -417,7 +417,7 @@ namespace llvm {
     // Unrecoverable error has occurred. Display the best diagnostic we can
     // and bail via exit(1). For now, most MC backend errors are unrecoverable.
     // FIXME: We should really do something about that.
-    LLVM_ATTRIBUTE_NORETURN void FatalError(SMLoc L, const Twine &Msg);
+    LLVM_ATTRIBUTE_NORETURN void FatalError(SMLoc L, const Twine &Msg) const;
   };
 
 } // end namespace llvm
diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp
index 6f0c391769f..601903a1731 100644
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -339,7 +339,7 @@ bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) {
   return !MCDwarfFiles[FileNumber].Name.empty();
 }
 
-void MCContext::FatalError(SMLoc Loc, const Twine &Msg) {
+void MCContext::FatalError(SMLoc Loc, const Twine &Msg) const {
   // If we have a source manager and a location, use it. Otherwise just
   // use the generic report_fatal_error().
   if (!SrcMgr || Loc == SMLoc())