diff --git a/include/libpmr/small_storage.h b/include/libpmr/small_storage.h
index fd08cba..bc29f64 100644
--- a/include/libpmr/small_storage.h
+++ b/include/libpmr/small_storage.h
@@ -454,7 +454,7 @@ public:
 template <std::size_t N>
 class small_storage {
 
-  static_assert(N > sizeof(holder<int, false>), "N must be greater than sizeof(holder<int, false>)");
+  static_assert(N >= sizeof(holder<void *, false>), "N must be greater than sizeof(holder<void *, false>)");
 
   alignas(std::max_align_t) std::array<::LIBIMP::byte, N> storage_;
 
@@ -467,11 +467,11 @@ public:
   }
 
   holder_base *get_holder() noexcept {
-    return static_cast<holder_base *>(storage_.data());
+    return reinterpret_cast<holder_base *>(storage_.data());
   }
 
   holder_base const *get_holder() const noexcept {
-    return static_cast<holder_base const *>(storage_.data());
+    return reinterpret_cast<holder_base const *>(storage_.data());
   }
 
   bool valid() const noexcept {
diff --git a/test/pmr/test_pmr_small_storage.cpp b/test/pmr/test_pmr_small_storage.cpp
index 6300f64..6e7b547 100644
--- a/test/pmr/test_pmr_small_storage.cpp
+++ b/test/pmr/test_pmr_small_storage.cpp
@@ -99,5 +99,21 @@ TEST(small_storage, holder_copy_move) {
   h12.destroy(alc);
 }
 
-TEST(small_storage, construct) {
+TEST(small_storage, sizeof) {
+  EXPECT_EQ(sizeof(pmr::holder_null), sizeof(void *));
+  EXPECT_EQ(sizeof(pmr::holder<int, true>), sizeof(void *) + imp::round_up(sizeof(int), alignof(void *)));
+  EXPECT_EQ(sizeof(pmr::holder<int, false>), sizeof(void *) + sizeof(void *));
+  EXPECT_EQ(sizeof(pmr::holder<void, true>), sizeof(void *) + sizeof(void *) + sizeof(pmr::detail::holder_info));
+  EXPECT_EQ(sizeof(pmr::holder<void, false>), sizeof(void *) + sizeof(void *));
+
+  // pmr::small_storage<4> s1;
+  EXPECT_EQ(sizeof(pmr::small_storage<16>)  , 16);
+  EXPECT_EQ(sizeof(pmr::small_storage<64>)  , 64);
+  EXPECT_EQ(sizeof(pmr::small_storage<512>) , 512);
+  EXPECT_EQ(sizeof(pmr::small_storage<4096>), 4096);
+}
+
+TEST(small_storage, construct) {
+  pmr::small_storage<64> ss;
+  SUCCEED();
 }