diff --git a/include/libpmr/small_storage.h b/include/libpmr/small_storage.h
index b2e3a8a..317b7a9 100644
--- a/include/libpmr/small_storage.h
+++ b/include/libpmr/small_storage.h
@@ -283,7 +283,7 @@ class holder<void, true> : public holder_base {
 public:
   template <typename Value>
   static std::size_t full_sizeof(std::size_t count) noexcept {
-    return offsetof(holder, info_) + detail::full_sizeof<Value>(count);
+    return sizeof(holder) - sizeof(info_) + detail::full_sizeof<Value>(count);
   }
 
   holder() noexcept
diff --git a/test/pmr/test_pmr_small_storage.cpp b/test/pmr/test_pmr_small_storage.cpp
index 34c2a44..3fae621 100644
--- a/test/pmr/test_pmr_small_storage.cpp
+++ b/test/pmr/test_pmr_small_storage.cpp
@@ -74,17 +74,24 @@ TEST(small_storage, holder_copy_move) {
   h5.destroy(alc);
   h6.destroy(alc);
 
-  pmr::holder<void, true> h7(alc, ::LIBIMP::types<int>{}, 10);
-  pmr::holder<void, true> h8, h9;
-  h7.copy_to(alc, &h8);
-  EXPECT_EQ(h7.count(), 10);
-  EXPECT_EQ(h8.count(), 10);
-  h7.move_to(alc, &h9);
-  EXPECT_EQ(h7.count(), 0);
-  EXPECT_EQ(h9.count(), 10);
-  h7.destroy(alc);
-  h8.destroy(alc);
-  h9.destroy(alc);
+  void *ph1 = std::malloc(pmr::holder<void, true>::full_sizeof<int>(10));
+  void *ph2 = std::malloc(pmr::holder<void, true>::full_sizeof<int>(10));
+  void *ph3 = std::malloc(pmr::holder<void, true>::full_sizeof<int>(10));
+  auto *h7 = ::new (ph1) pmr::holder<void, true>(alc, ::LIBIMP::types<int>{}, 10);
+  auto *h8 = ::new (ph2) pmr::holder<void, true>;
+  auto *h9 = ::new (ph2) pmr::holder<void, true>;
+  h7->copy_to(alc, h8);
+  EXPECT_EQ(h7->count(), 10);
+  EXPECT_EQ(h8->count(), 10);
+  h7->move_to(alc, h9);
+  EXPECT_EQ(h7->count(), 0);
+  EXPECT_EQ(h9->count(), 10);
+  h7->destroy(alc);
+  h8->destroy(alc);
+  h9->destroy(alc);
+  std::free(ph1);
+  std::free(ph2);
+  std::free(ph3);
 
   pmr::holder<void, false> h10(alc, ::LIBIMP::types<int>{}, 10);
   pmr::holder<void, false> h11, h12;