diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0b68c99..39bb8ff 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -21,6 +21,10 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang"
     target_compile_options(TurtleTestMain INTERFACE -Wno-unused-function)
   endif()
   if(TURTLE_WERROR)
+    check_cxx_compiler_flag(-Wdeprecated-declarations TURTLE_CXX_DEPRECATED_DECLARATIONS)
+    if(TURTLE_CXX_DEPRECATED_DECLARATIONS)
+      target_compile_options(TurtleTestMain INTERFACE -Wno-error=deprecated-declarations)
+    endif()
     target_compile_options(TurtleTestMain INTERFACE -Werror)
   endif()
 elseif(MSVC)
@@ -98,4 +102,4 @@ foreach(testFile IN LISTS benchFiles)
   add_executable(${name} EXCLUDE_FROM_ALL ${testFile})
   target_link_libraries(${name} PRIVATE turtle::turtle TurtleTestMain)
   add_test(NAME ${name} COMMAND "${CMAKE_COMMAND}" --build ${CMAKE_BINARY_DIR} --target ${name} --config $<CONFIG>)
-endforeach()
\ No newline at end of file
+endforeach()