diff --git a/CMakeLists.txt b/CMakeLists.txt
index 042cbeb2d5c3f870c8530493055492902833007d..1f8f7ea5d23abcf957f4a9db5a94141185f10d61 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,7 +23,6 @@ find_package(pegtl REQUIRED)
 
 if (CSG_CGAL_ENABLED)
    find_package(CGAL REQUIRED)
-   add_definitions(-DUSE_CGAL)
 endif()
 
 add_subdirectory(src/csg)
@@ -34,3 +33,7 @@ target_include_directories(csg-eb
   )
 
 target_compile_features(csg-eb PRIVATE cxx_std_17)
+
+if (CSG_CGAL_ENABLED)
+   target_compile_definitions(csg-eb PUBLIC USE_CGAL)
+endif()