diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec26d0b7..f2c279cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -312,6 +312,7 @@ endif()
 if(MINGW OR (NOT WIN32))
     find_package(directxmath CONFIG REQUIRED)
     find_package(directx-headers CONFIG REQUIRED)
+    target_compile_definitions(${PROJECT_NAME} PUBLIC USING_DIRECTX_HEADERS)
 else()
     find_package(directxmath CONFIG QUIET)
     find_package(directx-headers CONFIG QUIET)