diff --git a/llvm/unittests/ADT/SmallVectorTest.cpp b/llvm/unittests/ADT/SmallVectorTest.cpp
index 2d2668aca949..95bf33e5bfba 100644
--- a/llvm/unittests/ADT/SmallVectorTest.cpp
+++ b/llvm/unittests/ADT/SmallVectorTest.cpp
@@ -143,6 +143,7 @@ struct NonCopyable {
   NonCopyable() {}
   NonCopyable(NonCopyable &&) {}
   NonCopyable &operator=(NonCopyable &&) { return *this; }
+private:
   NonCopyable(const NonCopyable &) LLVM_DELETED_FUNCTION;
   NonCopyable &operator=(const NonCopyable &) LLVM_DELETED_FUNCTION;
 };