diff --git a/include/gsl/pointers b/include/gsl/pointers
index dc30166ee..bf26027aa 100644
--- a/include/gsl/pointers
+++ b/include/gsl/pointers
@@ -84,6 +84,7 @@ public:
 
     not_null(not_null&& other) = default;
     not_null(const not_null& other) = default;
+    not_null& operator=(not_null&& other) = default;
     not_null& operator=(const not_null& other) = default;
 
     constexpr T const & get() const
diff --git a/tests/notnull_tests.cpp b/tests/notnull_tests.cpp
index 83fc43057..146214cce 100644
--- a/tests/notnull_tests.cpp
+++ b/tests/notnull_tests.cpp
@@ -349,4 +349,38 @@ TEST_CASE("TestNotNullUniquePtrComparison") {
         // values are the same
         CHECK((NotNull1(std::make_unique<UniquePointerTestStruct>())->i == NotNull1(std::make_unique<UniquePointerTestStruct>())->i));
     }
-}
\ No newline at end of file
+}
+static_assert(!std::is_assignable<not_null<std::unique_ptr<int>>, std::unique_ptr<int>>::value, "not_null<std::unique_ptr> must be non copy constructible");
+static_assert(!std::is_copy_constructible<not_null<std::unique_ptr<int>>>::value, "not_null<std::unique_ptr> must be non copy constructible");
+static_assert(!std::is_copy_assignable<not_null<std::unique_ptr<int>>>::value, "not_null<std::unique_ptr> must be non copy assignable");
+static_assert(std::is_nothrow_move_constructible<not_null<std::unique_ptr<int>>>::value, "not_null<std::unique_ptr> must be no-throw move constructible");
+static_assert(std::is_nothrow_move_assignable<not_null<std::unique_ptr<int>>>::value, "not_null<std::unique_ptr> must be no-throw move assignable");
+
+
+TEST_CASE("TestNotNullUniquePtrMove") {
+
+    {
+        using NotNull1 = not_null<std::unique_ptr<int>>;
+
+        // values are the same
+        NotNull1 src(std::make_unique<int>(42));
+        NotNull1 dst(std::move(src));
+        #ifdef GSL_THROW_ON_CONTRACT_VIOLATION
+        CHECK_THROWS_AS(!src.get(), fail_fast);
+        #endif
+        CHECK(dst.get());
+        CHECK(*dst.get() == 42);
+        src = std::move(dst);
+        #ifdef GSL_THROW_ON_CONTRACT_VIOLATION
+        CHECK_THROWS_AS(!dst.get(), fail_fast);
+        #endif
+        CHECK(src.get());
+        CHECK(*src.get() == 42);
+    }
+    {
+        using NotNull1 = not_null<std::unique_ptr<UniquePointerTestStruct>>;
+
+        // values are the same
+        CHECK((NotNull1(std::make_unique<UniquePointerTestStruct>())->i == NotNull1(std::make_unique<UniquePointerTestStruct>())->i));
+    }
+}