diff --git a/extern/CMakeProject-libjpeg-turbo.cmake b/extern/CMakeProject-libjpeg-turbo.cmake
index 2ab52a9c47..0611956f2b 100644
--- a/extern/CMakeProject-libjpeg-turbo.cmake
+++ b/extern/CMakeProject-libjpeg-turbo.cmake
@@ -8,8 +8,11 @@ else()
   set(LIB_PATH ${LIB_DIR}/libturbojpeg.a)
 endif()
 
-if(MACOSX)
-  set(ARCH_FLAGS "-DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET} -DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
+if(APPLE)
+  LIST(APPEND ARCH_FLAGS
+    -DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}
+    -DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}
+  )
 endif()
 
 include(ExternalProject)