diff --git a/CMakeLists.txt b/CMakeLists.txt
index c92d91d..a9f4eae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,11 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
 
 SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
-OPTION(SDL2PP_WITH_IMAGE "Enable SDL2_image support" ON)
+IF(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
+	OPTION(SDL2PP_WITH_IMAGE "Enable SDL2_image support" ON)
+ELSE(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
+	# please set SDL2PP_WITH_IMAGE in parent project as needed
+ENDIF(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
 
 # depends
 FIND_PACKAGE(SDL2 REQUIRED)