diff --git a/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp b/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
index a9c95e9f38101..dd7c24d0c7ef7 100644
--- a/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
+++ b/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
@@ -95,6 +95,7 @@ static Optional<FixItHint> changeValue(const VarDecl &Var,
       return fixIfNotDangerous(*IgnoredParens, buildQualifier(Qualifier));
     return None;
   }
+  llvm_unreachable("Unknown QualifierPolicy enum");
 }
 
 static Optional<FixItHint> changePointerItself(const VarDecl &Var,