diff --git a/GaudiPluginService/CMakeLists.txt b/GaudiPluginService/CMakeLists.txt
index 8086e11ea83793b17cbf74e51f6406a4f4e224f3..2432be23d6e7fbed474e692fe83852464f9f7786 100644
--- a/GaudiPluginService/CMakeLists.txt
+++ b/GaudiPluginService/CMakeLists.txt
@@ -9,7 +9,7 @@ target_include_directories(DD4hepGaudiPluginMgr PUBLIC
   )
 
 if( APPLE ) 
-  target_compile_definitions(DD4hepGaudiPluginMgr APPLE)
+  target_compile_definitions(DD4hepGaudiPluginMgr PUBLIC APPLE)
 endif()
 target_compile_options(DD4hepGaudiPluginMgr PRIVATE -Wno-shadow)
 target_compile_options(DD4hepGaudiPluginMgr PRIVATE -Wno-unused)