diff --git a/tests/pure_cpp/smart_holder_poc_test.cpp b/tests/pure_cpp/smart_holder_poc_test.cpp
index 18c57fa19..5a56c2821 100644
--- a/tests/pure_cpp/smart_holder_poc_test.cpp
+++ b/tests/pure_cpp/smart_holder_poc_test.cpp
@@ -10,7 +10,7 @@ namespace helpers {
 struct movable_int {
     int valu;
     movable_int(int v) : valu{v} {}
-    movable_int(movable_int &&other) {
+    movable_int(movable_int &&other) noexcept {
         valu       = other.valu;
         other.valu = 91;
     }
@@ -325,7 +325,7 @@ TEST_CASE("error_cannot_disown_nullptr", "[E]") {
 TEST_CASE("indestructible_int-from_raw_ptr_unowned+as_raw_ptr_unowned", "[S]") {
     using zombie = helpers::indestructible_int;
     // Using placement new instead of plain new, to not trigger leak sanitizer errors.
-    static char memory_block[sizeof(zombie)];
+    static std::aligned_storage<sizeof(zombie), alignof(zombie)>::type memory_block[1];
     auto *value = new (memory_block) zombie(19);
     auto hld    = smart_holder::from_raw_ptr_unowned(value);
     REQUIRE(hld.as_raw_ptr_unowned<zombie>()->valu == 19);