diff --git a/clang/test/SemaCXX/ctad.cpp b/clang/test/SemaCXX/ctad.cpp
index 1e4980cc124be..00a861d0f567c 100644
--- a/clang/test/SemaCXX/ctad.cpp
+++ b/clang/test/SemaCXX/ctad.cpp
@@ -79,7 +79,7 @@ using size_t = decltype(sizeof(0));
 
 struct index_type
 {
-  size_t value{~0ull};
+  size_t value = 0;
   index_type() = default;
   constexpr index_type(size_t i) noexcept : value(i) {}
 };