diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 985fa56b13..e35a7bf02f 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -1051,7 +1051,11 @@ if(BUILD_CONVERT)
 
     target_link_libraries(IfcConvert ${IFCOPENSHELL_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${Boost_LIBRARIES} ${HDF5_LIBRARIES} ${USD_LIBRARIES})
 	if (WITH_RELATIONSHIP_VALIDATION)
-        set_target_properties(IfcConvert PROPERTIES COMPILE_FLAGS "-DWITH_RELATIONSHIP_VALIDATION")
+        set_property(TARGET IfcConvert APPEND_STRING PROPERTY COMPILE_FLAGS " -DWITH_RELATIONSHIP_VALIDATION")
+    endif()
+
+    if(WITH_CGAL AND CITYJSON_SUPPORT)
+        set_property(TARGET IfcConvert APPEND_STRING PROPERTY COMPILE_FLAGS " -DIFOPSH_WITH_CITYJSON")
     endif()
 
     if((NOT WIN32) AND BUILD_SHARED_LIBS)
diff --git a/src/ifcconvert/IfcConvert.cpp b/src/ifcconvert/IfcConvert.cpp
index 582d8fb4f3..90a64388bd 100644
--- a/src/ifcconvert/IfcConvert.cpp
+++ b/src/ifcconvert/IfcConvert.cpp
@@ -46,7 +46,7 @@
 
 #include "../ifcparse/utils.h"
 
-#ifdef IFOPSH_WITH_CGAL
+#ifdef IFOPSH_WITH_CITYJSON
 #include "./cityjson/geobim.h"
 #endif