1 files changed, 2 insertions, 2 deletions
diff --git a/include/llvm/ADT/BitVector.h b/include/llvm/ADT/BitVector.h
index 661437126d48..cf3756d0d9c1 100644
--- a/include/llvm/ADT/BitVector.h
+++ b/include/llvm/ADT/BitVector.h
@@ -21,6 +21,7 @@
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>
+#include <utility>
 
 namespace llvm {
 
@@ -45,14 +46,13 @@ public:
     BitWord *WordRef;
     unsigned BitPos;
 
-    reference();  // Undefined
-
   public:
     reference(BitVector &b, unsigned Idx) {
       WordRef = &b.Bits[Idx / BITWORD_SIZE];
       BitPos = Idx % BITWORD_SIZE;
     }
 
+    reference() = delete;
     reference(const reference&) = default;
 
     reference &operator=(reference t) {