diff --git a/tests/Boost_Tests/CMakeLists.txt b/tests/Boost_Tests/CMakeLists.txt
index fdbabe8d..aebac063 100644
--- a/tests/Boost_Tests/CMakeLists.txt
+++ b/tests/Boost_Tests/CMakeLists.txt
@@ -36,6 +36,6 @@ endif ()
 target_link_libraries(${PROJECT_NAME} ApprovalTests::ApprovalTests)
 add_test(NAME ${PROJECT_NAME} COMMAND ${PROJECT_NAME})
 
-#if (NOT "${CMAKE_SYSTEM_NAME}" MATCHES "Windows")
-#    include(WarningsAsErrors)
-#endif ()
+if (NOT "${CMAKE_SYSTEM_NAME}" MATCHES "CYGWIN")
+    include(WarningsAsErrors)
+endif ()