diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index c17510ae..07a551d 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -10257,9 +10257,11 @@
         !Prev->getIntegerType()->isDependentType() &&
         !Context.hasSameUnqualifiedType(EnumUnderlyingTy,
                                         Prev->getIntegerType())) {
+      // TODO: Highlight the underlying type of the redeclaration.
       Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
         << EnumUnderlyingTy << Prev->getIntegerType();
-      Diag(Prev->getLocation(), diag::note_previous_declaration);
+      Diag(Prev->getLocation(), diag::note_previous_declaration)
+          << Prev->getIntegerTypeRange();
       return true;
     }
   } else if (IsFixed != Prev->isFixed()) {