diff --git a/include/libpmr/allocator.h b/include/libpmr/allocator.h
index f28fc45..c9a279f 100644
--- a/include/libpmr/allocator.h
+++ b/include/libpmr/allocator.h
@@ -36,6 +36,11 @@ struct has_deallocate<T,
                                           std::declval<std::size_t>()))
   > : std::true_type {};
 
+template <typename T>
+using is_memory_resource = 
+  typename std::enable_if<has_allocate  <T>::value && 
+                          has_deallocate<T>::value>::type;
+
 } // namespace detail
 
 /**
diff --git a/test/pmr/test_pmr_allocator.cpp b/test/pmr/test_pmr_allocator.cpp
index 266e23c..1f3be4f 100644
--- a/test/pmr/test_pmr_allocator.cpp
+++ b/test/pmr/test_pmr_allocator.cpp
@@ -17,6 +17,15 @@ TEST(allocator, detail) {
   EXPECT_TRUE (pmr::detail::has_allocate<std::pmr::memory_resource>::value);
   EXPECT_TRUE (pmr::detail::has_allocate<std::pmr::polymorphic_allocator<int>>::value);
 #endif
+
+  EXPECT_FALSE(pmr::detail::has_deallocate<void>::value);
+  EXPECT_FALSE(pmr::detail::has_deallocate<int>::value);
+  EXPECT_FALSE(pmr::detail::has_deallocate<std::vector<int>>::value);
+  EXPECT_FALSE(pmr::detail::has_deallocate<std::allocator<int>>::value);
+#if defined(LIBIMP_CPP_17) && defined(__cpp_lib_memory_resource)
+  EXPECT_TRUE (pmr::detail::has_deallocate<std::pmr::memory_resource>::value);
+  EXPECT_FALSE(pmr::detail::has_deallocate<std::pmr::polymorphic_allocator<int>>::value);
+#endif
 }
 
 TEST(allocator, construct) {