diff --git a/test/pmr/test_pmr_allocator.cpp b/test/pmr/test_pmr_allocator.cpp
index d90abf9..266e23c 100644
--- a/test/pmr/test_pmr_allocator.cpp
+++ b/test/pmr/test_pmr_allocator.cpp
@@ -1,6 +1,8 @@
 
 #include <vector>
+#if defined(LIBIMP_CPP_17) && defined(__cpp_lib_memory_resource)
 #include <memory_resource>
+#endif
 
 #include "gtest/gtest.h"
 
@@ -11,8 +13,10 @@ TEST(allocator, detail) {
   EXPECT_FALSE(pmr::detail::has_allocate<int>::value);
   EXPECT_FALSE(pmr::detail::has_allocate<std::vector<int>>::value);
   EXPECT_TRUE (pmr::detail::has_allocate<std::allocator<int>>::value);
+#if defined(LIBIMP_CPP_17) && defined(__cpp_lib_memory_resource)
   EXPECT_TRUE (pmr::detail::has_allocate<std::pmr::memory_resource>::value);
   EXPECT_TRUE (pmr::detail::has_allocate<std::pmr::polymorphic_allocator<int>>::value);
+#endif
 }
 
 TEST(allocator, construct) {