diff --git a/src/openrct2-ui/CMakeLists.txt b/src/openrct2-ui/CMakeLists.txt
index 1d514db2ab..535fa9f087 100644
--- a/src/openrct2-ui/CMakeLists.txt
+++ b/src/openrct2-ui/CMakeLists.txt
@@ -11,7 +11,6 @@ option(DISABLE_OPENGL "Disable OpenGL support.")
 include(FindPkgConfig)
 
 # Third party libraries
-PKG_CHECK_MODULES(GL REQUIRED gl)
 PKG_CHECK_MODULES(SDL2 REQUIRED sdl2)
 if (NOT DISABLE_OPENGL)
     # GL doesn't work nicely with macOS, while find_package doesn't work with multiarch on Ubuntu.
@@ -29,10 +28,18 @@ file(GLOB_RECURSE OPENRCT2_UI_SOURCES
     "${CMAKE_CURRENT_LIST_DIR}/*.h"
     "${CMAKE_CURRENT_LIST_DIR}/*.hpp")
 
+if (APPLE)
+    file(GLOB_RECURSE OPENRCT2_UI_M_SOURCES "${CMAKE_CURRENT_LIST_DIR}/*.m")
+    set_source_files_properties(${OPENRCT2_UI_M_SOURCES} PROPERTIES COMPILE_FLAGS "-x objective-c -fmodules")
+
+    file(GLOB_RECURSE OPENRCT2_UI_MM_SOURCES "${CMAKE_CURRENT_LIST_DIR}/*.mm")
+    set_source_files_properties(${OPENRCT2_UI_MM_SOURCES} PROPERTIES COMPILE_FLAGS "-x objective-c++ -fmodules")
+endif ()
+
 # Outputs
 set (PROJECT openrct2)
 project(${PROJECT})
-add_executable(${PROJECT} ${OPENRCT2_UI_SOURCES})
+add_executable(${PROJECT} ${OPENRCT2_UI_SOURCES} ${OPENRCT2_UI_M_SOURCES} ${OPENRCT2_UI_MM_SOURCES})
 
 target_link_libraries(${PROJECT} "libopenrct2"
                                  ${SDL2_LIBRARIES}