diff --git a/clang/lib/Driver/Types.cpp b/clang/lib/Driver/Types.cpp
index e330352c2368a..8e1236bd08eca 100644
--- a/clang/lib/Driver/Types.cpp
+++ b/clang/lib/Driver/Types.cpp
@@ -28,7 +28,7 @@ struct TypeInfo {
     unsigned Bits = 0;
 
   public:
-    constexpr PhasesBitSet(const std::initializer_list<phases::ID> &Phases) {
+    constexpr PhasesBitSet(std::initializer_list<phases::ID> Phases) {
       for (auto Id : Phases)
         Bits |= 1 << Id;
     }