diff --git a/include/stdplus/pinned.hpp b/include/stdplus/pinned.hpp
index 9e04f97..c1490b2 100644
--- a/include/stdplus/pinned.hpp
+++ b/include/stdplus/pinned.hpp
@@ -1,6 +1,5 @@
 #pragma once
 #include <functional>
-#include <memory>
 #include <type_traits>
 #include <utility>
 
@@ -95,16 +94,6 @@
     constexpr PinnedRef(PinnedRef<U> u) noexcept : wrapper(u)
     {
     }
-
-    template <typename U>
-    constexpr PinnedRef(const std::unique_ptr<U>& u) noexcept : wrapper(*u)
-    {
-    }
-
-    template <typename U>
-    constexpr PinnedRef(const std::shared_ptr<U>& u) noexcept : wrapper(*u)
-    {
-    }
 };
 
 template <typename T>
@@ -116,18 +105,6 @@
 template <typename T>
 PinnedRef(const Pinned<T>& t) -> PinnedRef<const T>;
 
-template <typename T, typename Deleter>
-PinnedRef(std::unique_ptr<T, Deleter>& t) -> PinnedRef<T>;
-
-template <typename T, typename Deleter>
-PinnedRef(const std::unique_ptr<T, Deleter>& t) -> PinnedRef<T>;
-
-template <typename T>
-PinnedRef(std::shared_ptr<T>& t) -> PinnedRef<T>;
-
-template <typename T>
-PinnedRef(const std::shared_ptr<T>& t) -> PinnedRef<T>;
-
 } // namespace stdplus
 
 template <class T>
diff --git a/test/pinned.cpp b/test/pinned.cpp
index 96700c9..f33f41a 100644
--- a/test/pinned.cpp
+++ b/test/pinned.cpp
@@ -1,5 +1,4 @@
 #include <gtest/gtest.h>
-#include <memory>
 #include <stdplus/pinned.hpp>
 #include <string>
 
@@ -65,16 +64,6 @@
 
 TEST(PinnedRef, Basic)
 {
-    auto uptr = std::make_unique<std::string>("hi");
-    PinnedRef(uptr).get()[0] = 'd';
-    EXPECT_EQ("di", *uptr);
-    PinnedRef<const std::string> cref(uptr);
-    // cref.get()[0] = 'e';
-    EXPECT_EQ("di", cref.get());
-
-    auto sptr = std::make_shared<std::string>("hi");
-    EXPECT_EQ("hi", PinnedRef<std::string>(sptr).get());
-
     Pinned<std::string> pstr("hi");
     EXPECT_EQ("hi", PinnedRef<std::string>(pstr).get());
     EXPECT_EQ("hi", PinnedRef<const std::string>(pstr).get());