diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 6ec8219a..7e884c55 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -168,7 +168,9 @@ set(LIBMDBX_TEST_SOURCES
     nested.c++
     fork.c++)
 
-if(NOT MDBX_BUILD_CXX)
+if(MDBX_BUILD_CXX)
+  add_extra_test(probe DISABLED)
+else()
   probe_libcxx_filesystem()
   list(APPEND LIBMDBX_TEST_SOURCES "${MDBX_SOURCE_DIR}/mdbx.c++" ../mdbx.h++)
 endif()
diff --git a/test/extra/open.c++ b/test/extra/open.c++
index d475182c..bc955c83 100644
--- a/test/extra/open.c++
+++ b/test/extra/open.c++
@@ -7,7 +7,7 @@
 int main(int argc, const char *argv[]) {
   (void)argc;
   (void)argv;
-  std::cout << "FAKE-OK (since no C++20 std::thread and/or std::latch\n";
+  std::cout << "FAKE-OK (since no C++20 std::thread and/or std::latch)\n";
   return EXIT_SUCCESS;
 }
 
diff --git a/test/extra/probe.c++ b/test/extra/probe.c++
new file mode 100644
index 00000000..c80f5f87
--- /dev/null
+++ b/test/extra/probe.c++
@@ -0,0 +1,11 @@
+#include <iostream>
+
+#include "mdbx.h++"
+
+int main(int argc, const char *argv[]) {
+  (void)argc;
+  (void)argv;
+  std::cout
+      << "OK (but this is do-nothing test just for a check for compilation)\n";
+  return EXIT_SUCCESS;
+}