diff --git a/test/value_to.cpp b/test/value_to.cpp
index 5eb0b1efa..5d6fcc34a 100644
--- a/test/value_to.cpp
+++ b/test/value_to.cpp
@@ -564,6 +564,8 @@ class value_to_test
         BOOST_TEST(
             paths == (Paths{
                 "from/here", "to/there", "", "c:/" , "..", "../"}) );
+        BOOST_TEST_THROWS_WITH_LOCATION(
+            value_to<std::filesystem::path>( value(1), ctx... ));
 #endif // BOOST_NO_CXX17_HDR_FILESYSTEM
     }